Search Publications
Carbonyl Sulfide (OCS): Detections in Comets C/2002 T7 (LINEAR), C/2015 ER61 (PanSTARRS), and 21P/Giacobini-Zinner and Stringent Upper Limits in 46P/Wirtanen
Vervack, Ronald J., Jr.; Kawakita, Hideyo; DiSanti, Michael A. +6 more
Carbonyl sulfide (OCS) is one of the sulfur-bearing molecules detected in different astronomical environments, including comets. The present-day sulfur chemistry in comets may reveal much about the origin of these ices and their subsequent processing history. Cometary sulfur molecules such as H2S, H2CS, SO2, SO, CS…
TESS Reveals HD 118203 b to be a Transiting Planet
Vanderburg, Andrew; Latham, David W.; Kane, Stephen R. +34 more
The exoplanet HD 118203 b, orbiting a bright (V = 8.05) host star, was discovered using the radial velocity method by da Silva et al., but was not previously known to transit. Transiting Exoplanet Survey Satellite (TESS) photometry has revealed that this planet transits its host star. Nine planetary transits were observed by TESS, allowing us to m…
The Gemini Planet Imager View of the HD 32297 Debris Disk
Matthews, Brenda C.; Duchêne, Gaspard; Esposito, Thomas M. +61 more
We present new H-band scattered light images of the HD 32297 edge-on debris disk obtained with the Gemini Planet Imager. The disk is detected in total and polarized intensity down to a projected angular separation of 0"15, or 20 au. On the other hand, the large-scale swept-back halo remains undetected, likely a consequence of its markedly blue col…
Scaling K2. II. Assembly of a Fully Automated C5 Planet Candidate Catalog Using EDI-Vetter
Schlieder, Joshua E.; Petigura, Erik A.; Crossfield, Ian J. M. +5 more
We present a uniform transiting exoplanet candidate list for Campaign 5 of the K2 mission. This catalog contains 75 planets with seven multi-planet systems (five double, one triple, and one quadruple planet system). Within the range of our search, we find eight previously undetected candidates, with the remaining 67 candidates overlapping 51% of t…
The Most Metal-poor Stars in the Inner Bulge
Casey, Andrew R.; Ji, Alexander P.; Reggiani, Henrique +1 more
The bulge is the oldest component of the Milky Way. Since numerous simulations of Milky Way formation have predicted that the oldest stars at a given metallicity are found on tightly bound orbits, the Galaxy's oldest stars are likely metal-poor stars in the inner bulge with small apocenters (i.e., Rapo ≲ 4 kpc). In the past, stars with …
Establishing Earth's Minimoon Population through Characterization of Asteroid 2020 CD3
Fedorets, Grigori; Granvik, Mikael; Schwamb, Megan E. +20 more
We report on our detailed characterization of Earth's second known temporary natural satellite, or minimoon, asteroid 2020 CD3. An artificial origin can be ruled out based on its area-to-mass ratio and broadband photometry, which suggest that it is a silicate asteroid belonging to the S or V complex in asteroid taxonomy. The discovery o…
Chemical Properties of the Local Galactic Disk and Halo. I. Fundamental Properties of 1544 Nearby, High Proper-motion M Dwarfs and Subdwarfs
Lépine, Sébastien; Rich, R. Michael; Shara, Michael M. +2 more
Due to their ubiquity and very long main-sequence lifetimes, M dwarfs provide an excellent tool to study the formation and chemical enrichment history of our Galaxy. However, owing to their intrinsic faintness, the acquisition of high-resolution, high signal-to-noise spectra of low-mass stars has been limited to small numbers of very nearby stars,…
Supercatastrophic Disruption of Asteroids in the Context of SOHO Comet, Fireball, and Meteor Observations
Ye, Quanzhi; Brown, Peter; Clark, David +5 more
Granvik et al. reported an absence of asteroids on orbits with perihelia near the Sun that they attribute to the "supercatastrophic disruption" of these bodies. Here we investigate whether there is evidence for this process among other bodies with similarly low perihelia: near-Earth asteroids, Solar and Heliospheric Observatory (SOHO) comets, and …
A Ringed Pole-on Outflow from DO Tauri Revealed by ALMA
Zapata, Luis A.; Rodríguez, Luis F.; Guzmán, Andrés E. +3 more
We present new Atacama Large Millimeter/submillimeter Array (ALMA) Band 6 observations including the CO(2-1) line and 1.3 mm continuum emission from the surroundings of the young stellar object DO Tauri. The ALMA CO molecular data show three different series of rings at different radial velocities. These rings have radii around 220 and 800 au. We …
HD 191939: Three Sub-Neptunes Transiting a Sun-like Star Only 54 pc Away
Barclay, Thomas; Vanderburg, Andrew; Mikal-Evans, Thomas +38 more
We present the discovery of three sub-Neptune-sized planets transiting the nearby and bright Sun-like star HD 191939 (TIC 269701147, TOI 1339), a Ks = 7.18 mag G8 V dwarf at a distance of only 54 pc. We validate the planetary nature of the transit signals by combining 5 months of data from the Transiting Exoplanet Survey Satellite with …