Search Publications
TOI-811b and TOI-852b: New Transiting Brown Dwarfs with Similar Masses and Very Different Radii and Ages from the TESS Mission
Latham, David W.; Quinn, Samuel N.; Stassun, Keivan G. +30 more
We report the discovery of two transiting brown dwarfs (BDs), TOI-811b and TOI-852b, from NASA's Transiting Exoplanet Survey Satellite mission. These two transiting BDs have similar masses but very different radii and ages. Their host stars have similar masses, effective temperatures, and metallicities. The younger and larger transiting BD is TOI-…
Second Data Release of the All-sky NOIRLab Source Catalog
Nidever, David L.; Dey, Arjun; Fasbender, Katie +7 more
We announce the second data release (DR2) of the NOIRLab Source Catalog (NSC), using 412,116 public images from CTIO-4 m+DECam, the KPNO-4 m+Mosaic3, and the Bok-2.3 m+90Prime. NSC DR2 contains over 3.9 billion unique objects, 68 billion individual source measurements, covers ≈35,000 square degrees of the sky, has depths of ≈23 mag in most broadba…
Characterizing Undetected Stellar Companions with Combined Data Sets
Kraus, Adam L.; Mann, Andrew W.; Wood, Mackenna L.
Binaries play a critical role in the formation, evolution, and fundamental properties of planets, stars, and stellar associations. Observational studies in these areas often include a mix of observations aimed at detecting or ruling out the presence of stellar companions. Rarely can nondetections rule out all possible binary configurations. Here w…
Stellar Surface Inhomogeneities as a Potential Source of the Atmospheric Signal Detected in the K2-18b Transmission Spectrum
Kostov, Veselin B.; Barclay, Thomas; Schlieder, Joshua E. +5 more
Transmission spectroscopy of transiting exoplanets is a proven technique that can yield information on the composition and structure of a planet's atmosphere. However, transmission spectra may be compromised by inhomogeneities in the stellar photosphere. The sub-Neptune-sized habitable zone planet K2-18b has water absorption detected in its atmosp…
Rotation and Lithium Confirmation of a 500 pc Halo for the Open Cluster NGC 2516
Winn, J. N.; Bouma, L. G.; Bakos, G. Á. +2 more
Recent analyses of the Gaia data have identified diffuse stellar populations surrounding nearby open clusters. It is important to verify that these "halos," "tails," and "strings" are of similar ages and compositions as stars in the denser part of the cluster. We present an analysis of NGC 2516 (≈150 Myr), which has a classical tidal radius of 10 …
TOI-2076 and TOI-1807: Two Young, Comoving Planetary Systems within 50 pc Identified by TESS that are Ideal Candidates for Further Follow Up
Vanderburg, Andrew; Lester, Kathryn V.; Bieryla, Allyson +47 more
We report the discovery of two planetary systems around comoving stars: TOI-2076 (TIC 27491137) and TOI-1807 (TIC 180695581). TOI-2076 is a nearby (41.9 pc) multiplanetary system orbiting a young (204 ± 50 Myr), bright (K = 7.115 in TIC v8.1) start. TOI-1807 hosts a single transiting planet and is similarly nearby (42.58 pc), similarly young (180 …
Lithium Enrichment Signatures of Planetary Engulfment Events in Evolved Stars
Ness, Melissa K.; Cantiello, Matteo; MacLeod, Morgan +1 more
Planetary engulfment events have long been proposed as a lithium (Li) enrichment mechanism contributing to the population of Li-rich giants (A(Li) ≥ 1.5 dex). Using MESA stellar models and A(Li) abundance measurements obtained by the GALAH survey, we calculate the strength and observability of the surface Li enrichment signature produced by the en…
TIC 168789840: A Sextuply Eclipsing Sextuple Star System
Kostov, Veselin B.; Powell, Brian P.; Rappaport, Saul A. +48 more
We report the discovery of a sextuply eclipsing sextuple star system from TESS data, TIC 168789840, also known as TYC 7037-89-1, the first known sextuple system consisting of three eclipsing binaries. The target was observed in Sectors 4 and 5 during Cycle 1, with lightcurves extracted from TESS Full Frame Image data. It was also previously observ…
A Transiting Warm Giant Planet around the Young Active Star TOI-201
Trifonov, Trifon; Henning, Thomas; Latham, David W. +46 more
We present the confirmation of the eccentric warm giant planet TOI-201 b, first identified as a candidate in Transiting Exoplanet Survey Satellite photometry (Sectors 1-8, 10-13, and 27-28) and confirmed using ground-based photometry from Next Generation Transit Survey and radial velocities from FEROS, HARPS, CORALIE, and MINERVA-Australis. TOI-20…
The Volume-complete Sample of M Dwarfs with Masses 0.1 ≤ M/M⊙ ≤ 0.3 within 15 Parsecs
Henry, Todd J.; Winters, Jennifer G.; Irwin, Jonathan M. +4 more
M dwarfs with masses 0.1 ≤ M/M⊙ ≤ 0.3 are under increasing scrutiny because these fully convective stars pose interesting astrophysical questions regarding their magnetic activity and angular momentum history. They also afford the most accessible near future opportunity to study the atmospheres of terrestrial planets. Because they are i…