Department News

Fall 2023 Fieldtrip: PTYS 554

PTYS 554: Evolution of Planetary Surfaces, Northern Arizona, Meteor Crater
Professor Shane Byrne, Instructor
You can support the LPL Graduate Field Trip by donating to the Wilkening-Sill endowment.

PTYS 554 Fieldtrip 1

PTYS 554 Fieldtrip 2

 

Fall 2023 PTYS Graduates

Zarah Brown

ZARAH BROWN

November 3, 2023

Saturn's Upper Atmosphere in the Ultraviolet: Temperature and Compositional Trends from Cassini UVIS with Implications for Energy Balance and Dynamics

Advisor: Associate Professor Tommi Koskinen

New position: Postdoctoral Research Associate, LPL
 


Xiaohang Chen

Xiaohang Chen

November 9, 2023

Solar Energetic Particle Acceleration and Transport at the Curved and Evolving Shock Driven by Coronal Mass Ejections

Advisor: Professor Joe Giacalone

New position: Postdoctoral Research Associate, University of Michigan

Hitachi Scholarship in Electron Microscopy

The Kuiper Materials Imaging and Characterization Facility awards the Hitachi Scholarship in Electron Microscopy annually to two graduate students generating cutting-edge research and publications in the area of electron microscopy. The scholarship was established by Hitachi High-Technologies as part of their partnership with the University of Arizona.


Kelsey E. Hanson is a Ph.D. candidate in the School of Anthropology, specializing in the archaeology of the U.S. Southwest. She is particularly interested in how specialized knowledge is cultivated and circulated in communities and how this is encoded in material culture. In contemporary Pueblo communities, paint recipes are often maintained and passed down by ritual sodalities, making paint an ideal medium to understand sociopolitical organization through time. Drawing from anthropological archaeology, Indigenous philosophy, and conservation science, Hanson’s dissertation research problematizes paint technology to understand the circulation of specialized knowledge in the rise and fall of the Chaco World of northern New Mexico (A.D. 850–1300).

To characterize paint recipes, Hanson is currently analyzing particulate samples collected from archaeological pigments, paint production tools, and painted media using a combination of polarized light, microscopy, X-ray fluorescence, Fourier transform infrared spectroscopy, Raman spectroscopy, and scanning electron microscopy. Thus far, these analyses are revealing new mineral colorants, specialized processing techniques, and previously unrecognized traditions of paint production. By treating paint technology as a material proxy for specialized knowledge, Hanson is using the circulation of paint technology to understand changing power relations through time, offering a new perspective on the sociopolitical history of the Chaco World. Her work has been funded by the National Science Foundation, P.E.O. International, Crow Canyon Archaeological Center's Lister Fellowship, the Getty Foundation, the Society for American Archaeology, and many others.


Anton A. Samoylov is a third-year year Chemical Engineering Ph.D. student advised by Dr. Adam D. Printz in the Dept. of Chemical and Environmental Engineering. Anton’s research interests are motivated by a vision for a sustainable future, sparked by undergraduate research in sustainable plastics. His research currently focuses on engineering the mechanical stability of perovskite for applications in thin film photovoltaics through nano-compositing.

Advanced electron microscopy is crucial in guiding the development of composite perovskite thin films in Anton's experiments. "The Hitachi Electron Microscopy Scholarship is of great help when it comes to providing financial support to help me focus on my research as I prepare to submit my results for publication within the upcoming months. I hope my work will also help highlight the role Hitachi and the Kuiper Imaging Facility play in advancing quality research at the University of Arizona for a diverse set of departments."

PTYS Student Spotlight: Searra Foote

Searra is beginning her second year as a graduate student at LPL. She studies exoplanets to determine potential suitability for life, drawing from the fields of astrobiology and exoplanets. Searra develops and uses models to understand exoplanet atmospheres, which helps researchers learn not only more about the behavior of these planets, but also about other planets similar to Earth. Searra hopes that expanding research in the fields of astrobiology and exoplanets promotes public interest in science and inspires young people, especially girls, to pursue research in space science. Searra's faculty advisor is Associate Professor Ty Robinson.

Webb Telescope Discovers Water in Main-belt Comet

On Oct. 24, 2005, SPACEWATCH® observer Mike Read discovered a main-belt comet using the SPACEWATCH® 0.9m telescope on Kitt Peak mountain. Now, astronomers using the James Webb Space Telescope's Near-Infrared Spectrograph instrument, have discovered water vapor around that very object, Comet 238P/Read. This observation marks the first time that a gas – specifically water vapor – has been found around a comet in the main asteroid belt, indicating that water ice from the primordial solar system can be preserved there. However, the successful detection of water comes with a new puzzle: unlike other comets, Comet 238P/Read had no detectable carbon dioxide.

Comet Read is a main belt comet – an object that resides in the main asteroid belt but which periodically displays a halo, or coma, and tail like a comet. Main belt comets are a fairly new classification, and Comet Read was one of the original three comets used to establish the category. Before that, comets were understood to reside in the Kuiper Belt and Oort Cloud, beyond the orbit of Neptune, where their ices could be preserved farther from the Sun. Frozen material that vaporizes as they approach the Sun is what gives comets their distinctive coma and streaming tail, differentiating them from asteroids.

Scientists have long speculated that water ice could be preserved in the warmer asteroid belt, inside the orbit of Jupiter, but definitive proof was elusive – until Webb. But the missing carbon dioxide was a bigger surprise. Carbon dioxide generally makes up about 10% of the volatile material in a comet that can be easily vaporized by the Sun’s heat. The science team presents two possible explanations for the lack of carbon dioxide. One possibility is that Comet Read had carbon dioxide when it formed but has lost that because of warm temperatures. Another is that Comet Read may have formed in a particularly warm pocket of the solar system, where no carbon dioxide was available.

The next step is taking the research beyond Comet Read to see how other main belt comets compare.

The research is published in the journal Nature (Kelley et al., May 15, 2023): https://rdcu.be/dcBbV.


Image of 238P/Read captured by the NIRCam (Near-Infrared Camera) instrument on NASA’s James Webb Space Telescope on September 8, 2022. It displays the hazy halo, called the coma, and tail that are characteristic of comets, as opposed to asteroids. The dusty coma and tail result from the vaporization of ices as the Sun warms the main body of the comet. Credits: NASA, ESA, CSA, M. Kelley (Univ. of Maryland). Image processing: H. Hsieh (Planetary Science Inst.), A. Pagan (STScI)

 

 

 

 

Discovery image of Comet 238P/Read taken with the SPACEWATCH®.0.9m telescope.

 

 

 

2023 LPL Staff Award to Nancy Ramos

Nancy Ramos is the recipient of the LPL Staff Excellence Award for 2023.

In her role as Executive Assistant for the OSIRIS-REx management team, Nancy provides administrative, technical, and logistical support for the mission team. Nancy excels in her high-pressure role, making the organization of meetings, calendars, and large team events seem effortless. She ensures efficient team communication and manages special projects such as the team's recent move from the Drake building to the Kuiper building. In addition to her many professional contributions, Nancy volunteers to support department activities of all types and to foster a sense of community with LPL as well as the OSIRIS-REx team.

Prior to joining the OSIRIS-REx team, Nancy spent six years in similar administrative roles, first at Northern Arizona University and then at the University of Arizona. Nancy has a Bachelor’s degree in English from Northern Arizona University.

In her free time, Nancy enjoys spending time with her husband and two cats. Nancy adores all things feline and was founding president of Northern Arizona University’s student-run “trap, neuter, vaccinate, return, manage” organization, the Feral Cat Alliance.

Asteroid 47862 Nancyramos was named in her honor.

Undergraduate Minors Michelle Burr and Bennett Skinner

The Department of Planetary Sciences wrapped up the academic year with a count of 23 undergraduate minors in Planetary Sciences and 29 in Astrobiology. On April 28, LPL hosted a lunch for graduating seniors. Congratulations to graduating ASB minors Michelle Burr and Brooke Carruthers and to PTYS minors: Jared Bartunek, Morgan Cryder, Charlie Goldberg, Nicole Kerrison, Melissa Kontogiannis, Kevin May, and Bennett Skinner


Michelle Burr

Michelle majored in Cellular and Molecular Biology, minoring in Astrobiology for the opportunity to work with LPL scientists with HiRISE, OSIRIS-REx and NIRCam. She has been accepted into the Arizona Biological Biomedical doctoral program for fall 2022 and plans to earn a Ph.D. in Cellular Molecular Medicine. Her career goals include working for NASA on radiation and nucleic acid research.

Michelle cites two courses from the ASB minor program as particular favorites. She says that being able to learn from Regents Professor Alfred McEwen, Principal Investigator for HiRISE and instructor for PTYS 442 (Mars) was a "once in a lifetime experience." One of the assignments required her to provide a scientific rational for the Mars Reconnaissance Orbiter to use HiRISE to take a high-resolution image of her assigned Martian surface coordinates. The result was a one-of-a-kind framed high-resolution image of the Martian surface that hangs now in her room.

Professor Ilaria Pascucci's ASTR 450 (Origin of the Solar System and Other Planetary Systems) class was also a favorite. Michelle says, "This class was one of the most difficult classes I took in the minor, but...it made everything finally click for the formation of our solar system....I was able to link birth sites of planets and their formation with our solar system, and that was extraordinary."

Michelle is currently studying the effects of ionizing radiation on a species of the common house mosquito, a project she began at Pima Community College while in their ASCEND program. After transferring to UArizona, Michelle joined SEDS/ASCEND team and continued perfecting a model that allows mosquitos to enter near space and become introduced to ionizing radiation; she then analyzes their post-orbit DNA anomalies and protein disparities. In the course of this research, Michelle began volunteering with Dr. Julie Ledford (Cellular and Molecular Medicine) on research with asthma and airway diseases, specifically on a novel menopausal asthmatic model to understand the molecular pathways involved in onset of uncontrolled asthma post-menopausally.

Michelle enjoys hiking and rock climbing and takes advantage of Arizona dark skies for stargazing.


Bennett Neil Skinner

Bennett graduated with a major in Astronomy and Physics and minors in Computer Science and Mathematics in addition to Planetary Science. He will pursue an M.Sc. in Physics and Astronomy with collaborative work in Astrobiology at McMaster University beginning this fall and hopes to move into a Ph.D. program and an academic career in astronomy.

As an undergraduate, Bennett's favorite course was PTYS 450 (Origin of the Solar System and Other Planetary Systems), taught by Professor Ilaria Pascucci. The course inspired him to push his knowledge beyond the classroom, resulting in an honors thesis that looked at CI emission from protoplanetary disks using the Atacama Compact Array as a check on previous studies reporting CO depletion. Bennett writes, "We detected CI in half our sample, the highest rate of any protoplanetary disk CI survey thus far, nearly doubling the total number of CI detections. We found that CI fluxes are consistent with protoplanetary disk models assuming an ISM-like gas:dust ratio of 100, implying that CO is not depleted in the disk. We also found that CI flux correlates with CO isotopologue fluxes that trace the upper layers of the disk, showing that CI traces the upper layers of the disk where CO dissociates but CI has not yet ionized." Results of the project have been submitted to The Astrophysical Journal for publication. Before starting graduate school, Bennett will work on a project using disk wind data from the James Webb Space Telescope.

Bennett has wide-ranging hobbies, with particular interests in history, politics, geopolitics, and biology. He tries to track every major election in the world, make predictions, and watch the results as they roll in. He enjoys museums, hiking, and documentaries and is a fan of the sci-fi and fantasy genres, as well as video games.

Spring 2023: Destination Hawai'i

By Shane Byrne, Brett Carr, and Christopher Hamilton

Thanks to the generosity of donors and support from LPL, the PTYS 590 planetary geology field studies course was able to venture further and longer than usual this semester. Arizona and its surroundings is gifted with exceptionally diverse geology, but there are some processes, such as active volcanism and new lava flows, that are best seen elsewhere. This March, thirty of us packed our bags for the Big Island of Hawaiʻi to explore at some of the freshest lava flows in the world. Led by Professor Shane Byrne, we spent eleven geology-filled days on the trip and we needed every one of them! We were especially fortunate to have the expertise of Associate Professor Christopher Hamilton and Dr. Brett Carr, who have researched many of these field sites.

Our group stayed in Kona one night before departing for Volcano Village and our base of operations at the Holoholo In (yes, there’s only one ‘n’). Volcano village is ideally located and we had the entire hostel reserved for our group, so it made an excellent headquarters. Although Hawaiʻi is made up of several large shield volcanoes, we spent most of the trip on the nearby Kīlauea Volcano on the south side of the island and its rift zones. Much of the recent volcanic activity has been concentrated there in an area that is largely covered by Hawaiʻi Volcanoes National Park and off to the east.

The summit area of Kīlauea in the national park has many interesting sites. We started at the old site of the Hawaiian Volcano Observatory (now derelict) at the Uēkahuna Overlook, where we heard from a living legend of volcanology, Dr. Don Swanson. Our group had the opportunity to walk through the Kīlauea Iki caldera, which hosted a lava lake during an eruption in 1959. There’s still a lot of heat under the surface—fissures there continue to vent steam over 60 years after the eruption. The next day, we headed through the park to the coast, stopping at the devastation trail (devastated by tephra from the same 1959 Kīlauea Iki activity). We stopped at Maunaulu, a shield volcano that was built during an eruption in 1969–1974, and saw a perched lava pond on its flank. Our group got thoroughly drenched in the rain, but luckily that was the worst of the weather for the rest of the trip. We were able to dry out a little down on the coast looking at the Hōlei Sea Arch.

Occasionally, eruptions and lava flows wipe out neighborhoods in Hawaiʻi and that occurred near Pāhoa in 2018. Some enterprising landowners now provide tours of the area, giving us a chance to see a very young cone and lava field up close. We toured the Ahuʻailāʻau cone (Fissure 8 of the eruption), which is one of many eruption sites powered by activity many miles away at the Kīlauea caldera.

Lava–seawater interactions lead to spectacular explosions and we observed the results of those in several locations. Fine-grained debris from these explosions piles up in littoral cones that later can be eroded away by the waves. One of these cones near Southpoint is so rich in the mineral olivine that the sand on the adjoining beach is green. Other beaches we visited had the more common black sand (one of which came from the 2018 eruption above), which is basically the volcanic rock basalt that has been mechanically pounded into small pieces. Although it is not widespread on the Earth, this black sand has a special planetary connection as it’s quite similar to what we commonly see on Mars.

Hawaiʻi has a lot of other interesting sites to offer such as waterfalls, lava tubes, and incredible night-sky viewing. Fortunately, we were able to sample all these and more. The West Hawaii Astronomy Club met us with telescopes at the Mauna Kea visitors center one evening and wow’ed us with gorgeous views.

Hawaiʻi has a rich history that informs the modern culture. The many sites we visited provided an opportunity to learn about the history of Hawaiʻi. Footprints preserved in ash at Kaʻu desert attest to the long history of human habitation. Contact with Europeans began at Kealakekua Bay and set in motion a chain of contentious events that made Hawaii a U.S. state 180 years later. As planetary scientists, an issue of great relevance to us is telescope building on Mauna Kea. A complex dispute about how best to balance the science, economics, and sensitivity to Hawaiian customs and beliefs there continues to this day. A solution is elusive, but one can hope that education and understanding can lead to respect and ultimately agreement on a path forward.

Recent PTYS Graduates

Congratulations to Rachel FernandesAllison McGraw, Laura SeifertAmanda Stadermann, Tarunika Ramprasad, and Brandon Tober, and Weigang Liang LPL's newest alumni!

Rachel Fernandes
April 20, 2023 
 

Exoplanet Demographics Beyond Kepler: Giant Planets with Radial Velocity & Young Planets with TESS

Advisor: Professor Ilaria Pascucci

New position: Penn State, President's Postdoctoral Fellow and Center for Exoplanets and Habitable Worlds Fellow

 

Weigang Liang
May 18, 2023

An Investigation of Early Lunar History Using Gravity Data

Advisor: Associate Professor Jeff Andrews-Hanna


Allison McGraw
April 14, 2023

Asteroid-Meteorite Linkages through Infrared Spectroscopy

Advisor: Professor Vishnu Reddy

New position: Physics Laboratory Manager, Texas A&M (Physics & Astronomy)


Laura Seifert
April 12, 2023

Dust Condensation in Circumstellar Environments: Insight from Chemical and Microstructural Analyses of Presolar Grains

Advisor: Professor Tom Zega

New position: NASA Postdoctoral Program Fellow, Johnson Space Center


Amanda Stadermann
February 6, 2023

From Earth to Neptune: The Mineralogical Properties of Small Planetary Satellites and Co-orbital Objects

Advisor: Assistant Professor Jessica Barnes

New position: NASA Postdoctoral Program Fellow, Johnson Space Center


Tarunika Ramprasad
Dept. of Materials Science and Engineering
Minor in Planetary Science

April 10, 2023

Reverse Engineering the Thermochemistry of the Early Solar Nebula through Transmission Electron Microscopy and Thermodynamic Modelling of Refractory Planetary Materials

Advisor: Professor Tom Zega


Brandon Tober
Dept. of Geosciences
Minor in Planetary Science

April 24, 2023

Radar Sounding Analysis of Mountain Glaciers in Alaska: Revealing Ice Thickness, Subglacial Topography, and Geologic Structure

Advisor: Professor Jack Holt

 

Spacewatch Discovered Binary Asteroid System Didymos, Targeted by DART Mission

On Sept. 26, 2022, NASA's Double Asteroid Redirection Test (DART) mission spacecraft slammed into asteroid Dimorphos, giving scientists the opportunity to study how the impact altered its orbit around its larger twin, Didymos. DART launched on Nov. 24, 2021, with the aim of testing technology that could redirect asteroids that potentially threaten life on Earth.

But it was on a spring night in 1996 that a camera on the University of Arizona Steward Observatory's 36-inch telescope atop Kitt Peak captured three important images of a bright object sweeping across a backdrop of seemingly static stars. The object turned out to be a half-mile-wide, potentially hazardous near-Earth asteroid, caught on camera by Joseph Montani, a member of the university's Spacewatch group at LPL. Originally dubbed 1996 GT, the asteroid would later be renamed Didymos – Greek for "twin" – at Montani's suggestion. The name was inspired by the discovery in 2003 that the asteroid has a small companion, only 525 feet across.

Spacewatch is led by principal investigator Melissa Brucker. She is also on the science investigation team for DART. Spacewatch and other research groups plan to collect data on the light reflected from the two asteroids after impact. "We'll take a long series of images to measure the brightness of the system over time. Didymos and Dimorphos will look brighter when they're next to each other than when one is in front. In a series of images, we will be able to determine how long it takes Dimorphos to orbit Didymos," Brucker said. "Working on this mission is very exciting. I've been working on near-Earth asteroid tracking for eight years, so being able to participate in the first planetary defense demonstration is a really great opportunity."

Spacewatch was founded by LPL planetary scientists Tom Gehrels and Robert S. McMillan in 1980. The original goal of Spacewatch was to survey and discover small objects orbiting the sun, such as asteroids and comets, to better understand the evolution of the solar system. Spacewatch started shifting focus in 1998 and now follows up on discoveries made by astronomical surveys, such as LPL's Catalina Sky Survey, by monitoring the positions and movement of newly discovered potentially hazardous objects so that they do not become lost.

Spacewatch continues to use the Steward Observatory 0.9-meter (36-inch) telescope atop Kitt Peak, as well as the LPL 1.8-meter (72-inch) telescope, which has been operational on Kitt Peak since 2002. As one of the longest running asteroid tracking groups, Spacewatch can claim many firsts. It was the first group to use a charge-coupled device (CCD) camera to routinely survey the sky for comets and asteroids. It also claims the first CCD-discovered near-Earth asteroid, 1989 UP (now called 496816), and comet, dubbed 125P/1991 R2 Spacewatch. Spacewatch was also the first astronomical group to develop automated, real-time software for moving-object detection and the first to discover a near-Earth asteroid by software – 1990 SS (now called 11885 Summanus). Between May 1984 and June 2022, using UArizona telescopes on Kitt Peak, Spacewatch submitted 15,777,248 astrometric records of asteroids and comets to the Minor Planet Center. Of those 151,805 were of 15,072 unique near-Earth objects, including 1,883 potentially hazardous objects.

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