Search Publications
Transmission Spectroscopy for the Warm Sub-Neptune HD 3167c: Evidence for Molecular Absorption and a Possible High-metallicity Atmosphere
Gorjian, Varoujan; Fortney, Jonathan J.; Mikal-Evans, Thomas +26 more
We present a transmission spectrum for the warm (500-600 K) sub-Neptune HD 3167c obtained using the Hubble Space Telescope Wide Field Camera 3 infrared spectrograph. We combine these data, which span the 1.125-1.643 µm wavelength range, with broadband transit measurements made using Kepler/K2 (0.6-0.9 µm) and Spitzer/IRAC (4-5 µm…
TOI-2109: An Ultrahot Gas Giant on a 16 hr Orbit
Lester, Kathryn V.; Bieryla, Allyson; Latham, David W. +56 more
We report the discovery of an ultrahot Jupiter with an extremely short orbital period of 0.67247414 ± 0.00000028 days (~16 hr). The 1.347 ± 0.047 R Jup planet, initially identified by the Transiting Exoplanet Survey Satellite (TESS) mission, orbits TOI-2109 (TIC 392476080)-a T eff ~ 6500 K F-type star with a mass of 1.447 ± 0…
TESS Delivers Five New Hot Giant Planets Orbiting Bright Stars from the Full-frame Images
Henning, Thomas; Barclay, Thomas; Vanderburg, Andrew +115 more
We present the discovery and characterization of five hot and warm Jupiters—TOI-628 b (TIC 281408474; HD 288842), TOI-640 b (TIC 147977348), TOI-1333 b (TIC 395171208, BD+47 3521A), TOI-1478 b (TIC 409794137), and TOI-1601 b (TIC 139375960)—based on data from NASA's Transiting Exoplanet Survey Satellite (TESS). The five planets were identified fro…
TKS X: Confirmation of TOI-1444b and a Comparative Analysis of the Ultra-short-period Planets with Hot Neptunes
Batalha, Natalie M.; Latham, David W.; Rice, Malena +48 more
We report the discovery of TOI-1444b, a 1.4 R⊕ super-Earth on a 0.47 day orbit around a Sun-like star discovered by TESS. Precise radial velocities from Keck/HIRES confirmed the planet and constrained the mass to be 3.87 ± 0.71M⊕. The RV data set also indicates a possible nontransiting, 16 day planet (11.8 ± 2.9M⊕)…
The Youngest Planet to Have a Spin-Orbit Alignment Measurement AU Mic b
Kane, Stephen R.; Wittenmyer, Robert A.; Gaidos, Eric +21 more
We report measurements of the sky-projected spin-orbit angle for AU Mic b, a Neptune-size planet orbiting a very young (~20 Myr) nearby pre-main-sequence M-dwarf star, which also hosts a bright, edge-on, debris disk. The planet was recently discovered from preliminary analysis of radial-velocity observations and confirmed to be transiting its host…
The Mass-loss History of the Red Hypergiant VY CMa
Humphreys, Roberta M.; Davidson, Kris; Jones, Terry J. +3 more
Imaging and spectroscopy of the knots, clumps, and extended arcs in the complex ejecta of VY CMa confirm a record of high mass-loss events over the past few hundred years. Hubble Space Telescope/Space Telescope Imaging Spectrograph spectroscopy of numerous small knots close to the star allow us to measure their radial velocities from the strong K …
HST PanCET Program: A Complete Near-UV to Infrared Transmission Spectrum for the Hot Jupiter WASP-79b
Nikolov, Nikolay; Sing, David K.; MacDonald, Ryan J. +12 more
We present a new optical transmission spectrum of the hot Jupiter WASP-79b. We observed three transits with the STIS instrument mounted on the Hubble Space Telescope (HST), spanning 0.3-1.0 µm. Combining these transits with previous observations, we construct a complete 0.3-5.0 µm transmission spectrum of WASP-79b. Both HST and ground-…
Selection Functions in Astronomical Data Modeling, with the Space Density of White Dwarfs as a Worked Example
Everall, Andrew; Boubert, Douglas; Hogg, David W. +6 more
Statistical studies of cataloged object properties are central to astrophysics. But one cannot model those objects' population properties without the sample's selection function, the quantitative understanding of which objects could have ended up in such a catalog. As didactic introductions to this topic are scarce in the astrophysical literature,…
The Red Supergiant Content of M31 and M33
Drout, Maria R.; Massey, Philip; Levesque, Emily M. +2 more
We identify red supergiants (RSGs) in our spiral neighbors M31 and M33 using near-IR (NIR) photometry complete to a luminosity limit of $\mathrm{log}L/{L}_{\odot }=4.0$ . Our archival survey data cover 5 deg2 of M31, and 3 deg2 for M33, and are likely spatially complete for these massive stars. Gaia is used to remove foregrou…
Disequilibrium Chemistry in Exoplanet Atmospheres Observed with the Hubble Space Telescope
West, Robert A.; Zellem, Robert T.; Swain, Mark R. +3 more
Literature on the theory of exoplanet atmospheric disequilibrium chemistry is rich, although its observational counterpart has yet to emerge beyond the hints provided by a few targets in dedicated studies. We report results from an uniform data reduction and analysis for a catalog of 62 Hubble Space Telescope exoplanet transit spectra where we ass…