Search Publications
Setting the Stage for the Search for Life with the Habitable Worlds Observatory: Properties of 164 Promising Planet-survey Targets
Kane, Stephen R.; Dressing, Courtney D.; Harada, Caleb K. +1 more
The Decadal Survey on Astronomy and Astrophysics 2020 has recommended that NASA realize a large IR/optical/UV space telescope optimized for high-contrast imaging and spectroscopy of ∼25 exo-Earths and transformative general astrophysics. The NASA Exoplanet Exploration Program (ExEP) has subsequently released a list of 164 nearby (d < 25 pc) tar…
Modeling and Calibration of Gaia, Hipparcos, and Tycho-2 Astrometric Data for the Detection of Dark Companions
Feng, Fabo; Rui, Yicheng; Xuan, Yifan +1 more
Hidden within the Gaia satellite's multiple data releases lies a valuable cache of dark companions. To facilitate the efficient and reliable detection of these companions via combined analyses involving the Gaia, Hipparcos, and Tycho-2 catalogs, we introduce an astrometric modeling framework. This method incorporates analytical least-square minimi…
3D Selection of 167 Substellar Companions to Nearby Stars
Butler, R. Paul; Vogt, Steven S.; Oppenheimer, Rebecca +20 more
We analyze 5108 AFGKM stars with at least five high-precision radial velocity points, as well as Gaia and Hipparcos astrometric data, utilizing a novel pipeline developed in previous work. We find 914 radial velocity signals with periods longer than 1000 days. Around these signals, 167 cold giants and 68 other types of companions are identified, t…
The Hipparcos-Gaia Catalog of Accelerations: Gaia EDR3 Edition
Brandt, Timothy D.
We present a cross-calibration of Hipparcos and Gaia EDR3 intended to identify astrometrically accelerating stars and to fit orbits to stars with faint, massive companions. The resulting catalog, the EDR3 edition of the Hipparcos-Gaia Catalog of Accelerations (HGCA), provides three proper motions with calibrated uncertainties on the EDR3 reference…
The Asteroseismic Target List for Solar-like Oscillators Observed in 2 minute Cadence with the Transiting Exoplanet Survey Satellite
Chaplin, William J.; Davies, Guy R.; Latham, David W. +21 more
We present the target list of solar-type stars to be observed in short-cadence (2 minute) for asteroseismology by the NASA Transiting Exoplanet Survey Satellite (TESS) during its 2 year nominal survey mission. The solar-like Asteroseismic Target List (ATL) is comprised of bright, cool main-sequence and subgiant stars and forms part of the larger t…
KELT-22Ab: A Massive, Short-Period Hot Jupiter Transiting a Near-solar Twin
Bieryla, Allyson; Latham, David W.; Berlind, Perry +53 more
We present the discovery of KELT-22Ab, a hot Jupiter from the KELT-South survey. KELT-22Ab transits the moderately bright (V ∼ 11.1) Sun-like G2V star TYC 7518-468-1. The planet has an orbital period of P =1.3866529+/- 0.0000027 days, a radius of {R}P={1.285}-0.071+0.12 {R}J, and a relatively large mass …
The Hipparcos-Gaia Catalog of Accelerations
Brandt, Timothy D.
This paper presents a cross-calibrated catalog of Hipparcos and Gaia astrometry to enable their use in measuring changes in proper motion, i.e., accelerations in the plane of the sky. The final catalog adopts the reference frame of the second Gaia data release (DR2) and locally cross-calibrates both the scaled Hipparcos-Gaia DR2 positional differe…
BANYAN. IX. The Initial Mass Function and Planetary-mass Object Space Density of the TW HYA Association
Weinberger, Alycia J.; Donaldson, Jessica K.; Burgasser, Adam J. +15 more
A determination of the initial mass function (IMF) of the current, incomplete census of the 10 Myr-old TW Hya association (TWA) is presented. This census is built from a literature compilation supplemented with new spectra and 17 new radial velocities from ongoing membership surveys, as well as a reanalysis of Hipparcos data that confirmed HR 4334…
Spectral Properties of Cool Stars: Extended Abundance Analysis of 1,617 Planet-search Stars
Valenti, Jeff A.; Fischer, Debra A.; Brewer, John M. +1 more
We present a catalog of uniformly determined stellar properties and abundances for 1,617 F, G, and K stars using an automated spectral synthesis modeling procedure. All stars were observed using the HIRES spectrograph at Keck Observatory. Our procedure used a single line list to fit model spectra to observations of all stars to determine effective…
A Comprehensive Census of Nearby Infrared Excess Stars
Song, Inseok; Cotten, Tara H.
The conclusion of the Wide-Field Infrared Survey Explorer (WISE) mission presents an opportune time to summarize the history of using excess emission in the infrared as a tracer of circumstellar material and exploit all available data for future missions such as the James Webb Space Telescope. We have compiled a catalog of infrared excess stars fr…