Search Publications
A 20 Second Cadence View of Solar-type Stars and Their Planets with TESS: Asteroseismology of Solar Analogs and a Recharacterization of π Men c
Barclay, Thomas; Chaplin, William J.; Hermes, J. J. +50 more
We present an analysis of the first 20 second cadence light curves obtained by the TESS space telescope during its extended mission. We find improved precision of 20 second data compared to 2 minute data for bright stars when binned to the same cadence (≈10%-25% better for T ≲ 8 mag, reaching equal precision at T ≈ 13 mag), consistent with pre-fli…
Scanning Disk Rings and Winds in CO at 0.01-10 au: A High-resolution M-band Spectroscopy Survey with IRTF-iSHELL
Banzatti, Andrea; Bosman, Arthur D.; Pontoppidan, Klaus M. +11 more
We present an overview and first results from a M-band spectroscopic survey of planet-forming disks performed with iSHELL on the Infrared Telescope Facility, using two slits that provide resolving power R ≈ 60,000-92,000 (5-3.3 km s-1). iSHELL provides a nearly complete coverage at 4.52-5.24 µm in one shot, covering >50 lines f…
The Stellar Halo of the Galaxy is Tilted and Doubly Broken
Conroy, Charlie; Ting, Yuan-Sen; Johnson, Benjamin D. +7 more
Modern Galactic surveys have revealed an ancient merger that dominates the stellar halo of our galaxy (Gaia-Sausage-Enceladus, GSE). Using chemical abundances and kinematics from the H3 Survey, we identify 5559 halo stars from this merger in the radial range r Gal = 6-60kpc. We forward model the full selection function of H3 to infer th…
A Second Planet Transiting LTT 1445A and a Determination of the Masses of Both Worlds
Butler, R. Paul; Kristiansen, Martti H.; Omohundro, Mark +79 more
LTT 1445 is a hierarchical triple M-dwarf star system located at a distance of 6.86 pc. The primary star LTT 1445A (0.257 M ⊙) is known to host the transiting planet LTT 1445Ab with an orbital period of 5.36 days, making it the second-closest known transiting exoplanet system, and the closest one for which the host is an M dwarf. Using …
Keck/NIRSPEC Studies of He I in the Atmospheres of Two Inflated Hot Gas Giants Orbiting K Dwarfs: WASP-52b and WASP-177b
Kirk, James; López-Morales, Mercedes; Alam, Munazza K. +5 more
We present the detection of neutral helium at 10833 Å in the atmosphere of WASP-52b and tentative evidence of helium in the atmosphere of the grazing WASP-177b, using high-resolution observations acquired with the NIRSPEC instrument on the Keck II telescope. We detect excess absorption by helium in WASP-52b's atmosphere of 3.44% ± 0.31% (11σ), or …
A Census of the Stellar Populations in the Sco-Cen Complex
Luhman, K. L.
I have used high-precision photometry and astrometry from the early installment of the third data release of Gaia (EDR3) to perform a survey for members of the stellar populations within the Sco-Cen complex, which consist of Upper Sco, UCL/LCC, the V1062 Sco group, Ophiuchus, and Lupus. Among Gaia sources with σ π < 1 mas, I have i…
The TESS-Keck Survey: Science Goals and Target Selection
Batalha, Natalie M.; Bieryla, Allyson; Latham, David W. +62 more
The Kepler and TESS missions have demonstrated that planets are ubiquitous. However, the success of these missions heavily depends on ground-based radial velocity (RV) surveys, which combined with transit photometry can yield bulk densities and orbital properties. While most Kepler host stars are too faint for detailed follow-up observations, TESS…
The Open Cluster Chemical Abundances and Mapping Survey. VI. Galactic Chemical Gradient Analysis from APOGEE DR17
Bizyaev, Dmitry; Cunha, Katia; Majewski, Steven R. +19 more
The goal of the Open Cluster Chemical Abundances and Mapping (OCCAM) survey is to constrain key Galactic dynamic and chemical evolution parameters by the construction and analysis of a large, comprehensive, uniform data set of infrared spectra for stars in hundreds of open clusters. This sixth contribution from the OCCAM survey presents analysis o…
TOI-1452 b: SPIRou and TESS Reveal a Super-Earth in a Temperate Orbit Transiting an M4 Dwarf
Latham, David W.; Tamura, Motohide; Stassun, Keivan G. +53 more
Exploring the properties of exoplanets near or inside the radius valley provides insight on the transition from the rocky super-Earths to the larger, hydrogen-rich atmosphere mini-Neptunes. Here, we report the discovery of TOI-1452b, a transiting super-Earth (R p = 1.67 ± 0.07 R ⊕) in an 11.1 day temperate orbit (T eq
Tentative Evidence for Water Vapor in the Atmosphere of the Neptune-sized Exoplanet HD 106315c
Gorjian, Varoujan; Fortney, Jonathan J.; Mikal-Evans, Thomas +27 more
We present a transmission spectrum for the Neptune-sized exoplanet HD 106315c from optical to infrared wavelengths based on transit observations from the Hubble Space Telescope/Wide Field Camera 3, K2, and Spitzer. The spectrum shows tentative evidence for a water absorption feature in the 1.1-1.7 µm wavelength range with a small amplitude o…