PTYS/LPL Faculty

Steward N208B

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Daniel Apai

Associate Professor

Astrobiology, Exoplanets; Planetary Formation and Evolution, Planetary Atmospheres

Dr. Apai’s research focuses on exoplanetary systems, including planet formation, planetary atmospheres, exoplanet discovery and characterization. His work covers habitable and non-habitable small exoplanets, gas giant exoplanets, and brown dwarfs.

Read more about Dr. Apai's research on his website and blog on exoplanet exploration and astrobiology.

Ph.D., 2004, University of Heidelberg

Years with LPL: 2011 to present

Current Grants

  • ACCESS - A transmission spectroscopy survey of exoplanet atmospheres with the goal to compile a comprehensive spectral library of exoplanets, from hot jupiters to super-earths.
  • Scorpion Survey - A 100-star VLT extreme adaptive optics high-contrast imaging survey for giant exoplanets.
  • Earths in Other Solar Systems - A large interdisciplinary NASA Nexus for Exoplanet System Science project to explore how habitable zone earth-sized planets acquire their volatiles and organics required to be habitable. This 5-year, $5.7M interdisciplinary project includes 17 graduate students and postdocs and 20 senior investigators.
  • Cloud Atlas - A Large Treasury program with the Hubble Space Telescope to determine how cloud deck properties in brown dwarfs and exoplanets depend on surface gravity and temperature.
  • Extrasolar Storms - The Physics and Chemistry of Evolving Cloud Structures in Brown Dwarf Atmospheres: Spitzer Exploration Science Program (PI Apai)

Current Graduate Students

Former Students

  • Davin Flateau, 2015 (M.S.)
  • Jake Ryan Hanson, 2014, University of Arizona
  • Judit Szulagyi, 2010-2011, Space Telescope Science Institute and Eotvos Lorand University
  • Laszlo Szucs, 2009-2011, Space Telescope Science Institute and University of Szeged
  • Veselin Kostov, 2009, Johns Hopkins University
  • Justin Rogers, 2008-2012, Johns Hopkins University
  • Emily Hardegree-Ullman, 2006-2007, University of Arizona
  • Yancey Sechrest, 2005-2006, University of Arizona
  • Emily E. Berkson (UA Astronomy)
  • William Nolan (UA CAMPARE)

Current Postdocs

  • Elena Manjavacas
  • Jonathan Rees

Former Postdocs

  • Esther Buenzli
  • Theodora Karalidi
  • Gijs Mulders
  • Hao Yang

 

Complete publications list available from: NASA ADS Author search: Daniel Apai

Refereed publications (NASA ADS): Calendar Years 2018 through June 2020

Bixel, A., Apai, D. Testing Earthlike Atmospheric Evolution on Exo-Earths through Oxygen Absorption: Required Sample Sizes and the Advantage of Age-based Target Selection 2020ApJ...896..131B

Wagner, K., Stone, J., Dong, R., Ertel, S., Apai, D., Doelman, D., Bohn, A., Najita, J., Brittain, S., Kenworthy, M., Keppler, M., Webster, R., Mailhot, E., Snik, F. First Images of the Protoplanetary Disk around PDS 201 2020AJ....159..252W

Gibbs, A., Bixel, A., Rackham, B. V., Apai, D., Schlecker, M., Espinoza, N., Mancini, L., Chen, W.-P., Henning, T., Gabor, P., Boyle, R., Perez Chavez, J., Mousseau, A., Dietrich, J., Jay Socia, Q., Ip, W., Ngeow, C.-C., Tsai, A.-L., Bhandare, A., Marian, V., Baehr, H., Brown, S., Häberle, M., Keppler, M., Molaverdikhani, K., Sarkis, P. EDEN: Sensitivity Analysis and Transiting Planet Detection Limits for Nearby Late Red Dwarfs 2020AJ....159..169G

Zhou, Y., Apai, D., Bedin, L. R., Lew, B. W. P., Schneider, G., Burgasser, A. J., Manjavacas, E., Karalidi, T., Metchev, S., Miles-Páez, P. A., Cowan, N. B., Lowrance, P. J., Radigan, J. Cloud Atlas: High-precision HST/WFC3/IR Time-resolved Observations of Directly Imaged Exoplanet HD 106906b 2020AJ....159..140Z

Lew, B. W. P., Apai, D., Zhou, Y., Radigan, J., Marley, M., Schneider, G., Cowan, N. B., Miles-Páez, P. A., Manjavacas, E., Karalidi, T., Bedin, L. R., Lowrance, P. J., Burgasser, A. J. Cloud Atlas: Weak Color Modulations Due to Rotation in the Planetary-mass Companion GU Psc b and 11 Other Brown Dwarfs 2020AJ....159..125L

Kitzmann, D., Heng, K., Oreshenko, M., Grimm, S. L., Apai, D., Bowler, B. P., Burgasser, A. J., Marley, M. S. Helios-r2: A New Bayesian, Open-source Retrieval Model for Brown Dwarfs and Exoplanet Atmospheres 2020ApJ...890..174K

Weaver, I. C., López-Morales, M., Espinoza, N., Rackham, B. V., Osip, D. J., Apai, D., Jordán, A., Bixel, A., Lewis, N. K., Alam, M. K., Kirk, J., McGruder, C., Rodler, F., Fienco, J. ACCESS: A Visual to Near-infrared Spectrum of the Hot Jupiter WASP-43b with Evidence of H2O, but No Evidence of Na or K 2020AJ....159...13W

Bixel, A., Apai, D. Identifying Exo-Earth Candidates in Direct Imaging Data through Bayesian Classification 2020AJ....159....3B

Mulders, G. D., Mordasini, C., Pascucci, I., Ciesla, F. J., Emsenhuber, A., Apai, D. The Exoplanet Population Observation Simulator. II. Population Synthesis in the Era of Kepler 2019ApJ...887..157M

Miles-Páez, P. A., Metchev, S., Apai, D., Zhou, Y., Manjavacas, E., Karalidi, T., Lew, B. W. P., Burgasser, A. J., Bedin, L. R., Cowan, N., Lowrance, P. J., Marley, M. S., Radigan, J., Schneider, G. Cloud Atlas: Variability in and out of the Water Band in the Planetary-mass HD 203030B Points to Cloud Sedimentation in Low-gravity L Dwarfs 2019ApJ...883..181M

Boehle, A., Quanz, S. P., Lovis, C., Ségransan, D., Udry, S., Apai, D. Combining high-contrast imaging and radial velocities to constrain the planetary architectures of nearby stars 2019A&A...630A..50B

Bedin, L. R., Salaris, M., Anderson, J., Libralato, M., Apai, D., Nardiello, D., Rich, R. M., Bellini, A., Dieball, A., Bergeron, P., Burgasser, A. J., Milone, A. P., Marino, A. F. The HST large programme on NGC 6752 - III. Detection of the peak of the white dwarf luminosity function 2019MNRAS.488.3857B

Leggett, S. K., Dupuy, T. J., Morley, C. V., Marley, M. S., Best, W. M. J., Liu, M. C., Apai, D., Casewell, S. L., Geballe, T. R., Gizis, J. E., Pineda, J. S., Rieke, M., Wright, G. S. 3.8 μm Imaging of 400-600 K Brown Dwarfs and Orbital Constraints for WISEP J045853.90+643452.6AB 2019ApJ...882..117L

Wagner, K., Stone, J. M., Spalding, E., Apai, D., Dong, R., Ertel, S., Leisenring, J., Webster, R. Thermal Infrared Imaging of MWC 758 with the Large Binocular Telescope: Planetary-driven Spiral Arms? 2019ApJ...882...20W

Apai, D., Milster, T. D., Kim, D. W., Bixel, A., Schneider, G., Liang, R., Arenberg, J. A Thousand Earths: A Very Large Aperture, Ultralight Space Telescope Array for Atmospheric Biosignature Surveys 2019AJ....158...83A

Zhou, Y., Apai, D., Lew, B. W. P., Schneider, G., Manjavacas, E., Bedin, L. R., Cowan, N. B., Marley, M. S., Radigan, J., Karalidi, T., Lowrance, P. J., Miles-Páez, P. A., Metchev, S., Burgasser, A. J. Erratum: “Cloud Atlas: High-contrast Time-resolved Observations of Planetary-mass Companions” (2019, AJ, 157, 128) 2019AJ....158...52Z

Wagner, K., Apai, D., Kratter, K. M. On the Mass Function, Multiplicity, and Origins of Wide-orbit Giant Planets 2019ApJ...877...46W

Milone, A. P., Marino, A. F., Bedin, L. R., Anderson, J., Apai, D., Bellini, A., Dieball, A., Salaris, M., Libralato, M., Nardiello, D., Bergeron, P., Burgasser, A. J., Rees, J. M., Rich, R. M., Richer, H. B. The HST Large Programme on NGC 6752 - II. Multiple populations at the bottom of the main sequence probed in NIR 2019MNRAS.484.4046M

Manjavacas, E., Apai, D., Lew, B. W. P., Zhou, Y., Schneider, G., Burgasser, A. J., Karalidi, T., Miles-Páez, P. A., Lowrance, P. J., Cowan, N., Bedin, L. R., Marley, M. S., Metchev, S., Radigan, J. Cloud Atlas: Rotational Spectral Modulations and Potential Sulfide Clouds in the Planetary-mass, Late T-type Companion Ross 458C 2019ApJ...875L..15M

Bedin, L. R., Salaris, M., Rich, R. M., Richer, H., Anderson, J., Bettoni, D., Nardiello, D., Milone, A. P., Marino, A. F., Libralato, M., Bellini, A., Dieball, A., Bergeron, P., Burgasser, A. J., Apai, D. The HST Large Programme on NGC 6752. I. Serendipitous discovery of a dwarf Galaxy in background 2019MNRAS.484L..54B

Zhou, Y., Apai, D., Lew, B. W. P., Schneider, G., Manjavacas, E., Bedin, L. R., Cowan, N. B., Marley, M. S., Radigan, J., Karalidi, T., Lowrance, P. J., Miles-Páez, P. A., Metchev, S., Burgasser, A. J. Cloud Atlas: High-contrast Time-resolved Observations of Planetary-mass Companions 2019AJ....157..128Z

Manjavacas, E., Apai, D., Zhou, Y., Lew, B. W. P., Schneider, G., Metchev, S., Miles-Páez, P. A., Radigan, J., Marley, M. S., Cowan, N., Karalidi, T., Burgasser, A. J., Bedin, L. R., Lowrance, P. J., Kauffmann, P. Cloud Atlas: Hubble Space Telescope Near-infrared Spectral Library of Brown Dwarfs, Planetary-mass Companions, and Hot Jupiters 2019AJ....157..101M

Rackham, B. V., Apai, D., Giampapa, M. S. The Transit Light Source Effect. II. The Impact of Stellar Heterogeneity on Transmission Spectra of Planets Orbiting Broadly Sun-like Stars 2019AJ....157...96R

Bixel, A., Rackham, B. V., Apai, D., Espinoza, N., López-Morales, M., Osip, D., Jordán, A., McGruder, C., Weaver, I. ACCESS: Ground-based Optical Transmission Spectroscopy of the Hot Jupiter WASP-4b 2019AJ....157...68B

Espinoza, N., Rackham, B. V., Jordán, A., Apai, D., López-Morales, M., Osip, D. J., Grimm, S. L., Hoeijmakers, J., Wilson, P. A., Bixel, A., McGruder, C., Rodler, F., Weaver, I., Lewis, N. K., Fortney, J. J., Fraine, J. ACCESS: a featureless optical transmission spectrum for WASP-19b from Magellan/IMACS 2019MNRAS.482.2065E

Gibbs, A., Wagner, K., Apai, D., Moór, A., Currie, T., Bonnefoy, M., Langlois, M., Lisse, C. VLT/SPHERE Multiwavelength High-contrast Imaging of the HD 115600 Debris Disk: New Constraints on the Dust Geometry and the Presence of Young Giant Planets 2019AJ....157...39G

Stone, J. M., Skemer, A. J., Hinz, P. M., Bonavita, M., Kratter, K. M., Maire, A.-L., Defrere, D., Bailey, V. P., Spalding, E., Leisenring, J. M., Desidera, S., Bonnefoy, M., Biller, B., Woodward, C. E., Henning, T., Skrutskie, M. F., Eisner, J. A., Crepp, J. R., Patience, J., Weigelt, G., De Rosa, R. J., Schlieder, J., Brandner, W., Apai, D., Su, K., Ertel, S., Ward-Duong, K., Morzinski, K. M., Schertl, D., Hofmann, K.-H., Close, L. M., Brems, S. S., Fortney, J. J., Oza, A., Buenzli, E., Bass, B. The LEECH Exoplanet Imaging Survey: Limits on Planet Occurrence Rates under Conservative Assumptions 2018AJ....156..286S

Pinhas, A., Rackham, B. V., Madhusudhan, N., Apai, D. Retrieval of planetary and stellar properties in transmission spectroscopy with AURA 2018MNRAS.480.5314P

Zhang, Z., Zhou, Y., Rackham, B. V., Apai, D. The Near-infrared Transmission Spectra of TRAPPIST-1 Planets b, c, d, e, f, and g and Stellar Contamination in Multi-epoch Transit Spectra 2018AJ....156..178Z

Wagner, K., Follete, K. B., Close, L. M., Apai, D., Gibbs, A., Keppler, M., Müller, A., Henning, T., Kasper, M., Wu, Y.-L., Long, J., Males, J., Morzinski, K., McClure, M. Magellan Adaptive Optics Imaging of PDS 70: Measuring the Mass Accretion Rate of a Young Giant Planet within a Gapped Disk 2018ApJ...863L...8W

Long, F., Herczeg, G. J., Pascucci, I., Apai, D., Henning, T., Manara, C. F., Mulders, G. D., Szűcs, L., Hendler, N. P. An ALMA Survey of Faint Disks in the Chamaeleon I Star-forming Region: Why Are Some Class II Disks so Faint? 2018ApJ...863...61L

Mulders, G. D., Pascucci, I., Apai, D., Ciesla, F. J. The Exoplanet Population Observation Simulator. I. The Inner Edges of Planetary Systems 2018AJ....156...24M

Burnam-Fink, M., Desch, S. J., Scalice, D., Davis, H., Huff, C. J., Apai, D. Impact of the Arizona NExSS Winter School on Astrobiology Knowledge and Attitudes 2018AsBio..18..365B

Zhou, Y., Apai, D., Metchev, S., Lew, B. W. P., Schneider, G., Marley, M. S., Karalidi, T., Manjavacas, E., Bedin, L. R., Cowan, N. B., Miles-Páez, P. A., Lowrance, P. J., Radigan, J., Burgasser, A. J. Cloud Atlas: Rotational Modulations in the L/T Transition Brown Dwarf Companion HN Peg B 2018AJ....155..132Z

Wagner, K., Dong, R., Sheehan, P., Apai, D., Kasper, M., McClure, M., Morzinski, K. M., Close, L., Males, J., Hinz, P., Quanz, S. P., Fung, J. The Orbit of the Companion to HD 100453A: Binary-driven Spiral Arms in a Protoplanetary Disk 2018ApJ...854..130W

Libralato, M., Bellini, A., Bedin, L. R., Moreno D., E., Fernández-Trincado, J. G., Pichardo, B., van der Marel, R. P., Anderson, J., Apai, D., Burgasser, A. J., Fabiola Marino, A., Milone, A. P., Rees, J. M., Watkins, L. L. The HST Large Programme on ω Centauri. III. Absolute Proper Motion 2018ApJ...854...45L

Rackham, B. V., Apai, D., Giampapa, M. S. The Transit Light Source Effect: False Spectral Features and Incorrect Densities for M-dwarf Transiting Planets 2018ApJ...853..122R

Bellini, A., Libralato, M., Bedin, L. R., Milone, A. P., van der Marel, R. P., Anderson, J., Apai, D., Burgasser, A. J., Marino, A. F., Rees, J. M. The HST Large Programme on ω Centauri. II. Internal Kinematics 2018ApJ...853...86B

Manjavacas, E., Apai, D., Zhou, Y., Karalidi, T., Lew, B. W. P., Schneider, G., Cowan, N., Metchev, S., Miles-Páez, P. A., Burgasser, A. J., Radigan, J., Bedin, L. R., Lowrance, P. J., Marley, M. S. Cloud Atlas: Discovery of Rotational Spectral Modulations in a Low-mass, L-type Brown Dwarf Companion to a Star 2018AJ....155...11M

Available filesSizeCreated
PDF icon Apai_Bio_Jan_2019.pdf157.38 KBFebruary 13, 2019
Semester Course Day/Time Location Resources
Spring 2017 ASTR 475-001
Spring 2017 PTYS 575-001

Last updated on September 11, 2020