Search Publications
HyDRA-H: Simultaneous Hybrid Retrieval of Exoplanetary Emission Spectra
Madhusudhan, Nikku; Gandhi, Siddharth; Hawker, George +1 more
High-resolution Doppler spectroscopy has been used to detect several chemical species in exoplanetary atmospheres. Such detections have traditionally relied on cross correlation of observed spectra against spectral model templates, an approach that is successful for detecting chemical species but not optimized for constraining abundances. Recent w…
ACRONYM. III. Radial Velocities for 336 Candidate Young Low-mass Stars in the Solar Neighborhood, Including 77 Newly Confirmed Young Moving Group Members
Weinberger, Alycia J.; Kraus, Adam L.; Shkolnik, Evgenya L. +4 more
Young, low-mass stars in the solar neighborhood are vital for completing the mass function for nearby, young coeval groups, establishing a more complete census for evolutionary studies, and providing targets for direct-imaging exoplanet and/or disk studies. We present properties derived from high-resolution optical spectra for 336 candidate young …
The Relationship between Globular Cluster Mass, Metallicity, and Light-element Abundance Variations
Cohen, Roger E.; Ting, Yuan-Sen; Wyse, Rosemary F. G. +7 more
We investigate aluminum abundance variations in the stellar populations of globular clusters using both literature measurements of sodium and aluminum and APOGEE measurements of nitrogen and aluminum abundances. For the latter, we show that the Payne is the most suitable of the five available abundance pipelines for our purposes. Our combined samp…
A Hubble PanCET Study of HAT-P-11b: A Cloudy Neptune with a Low Atmospheric Metallicity
Nikolov, Nikolay; Mikal-Evans, Thomas; Sing, David K. +14 more
We present the first comprehensive look at the 0.35-5 µm transmission spectrum of the warm (∼800 K) Neptune HAT-P-11b derived from 13 individual transits observed using the Hubble and Spitzer Space Telescopes. Along with the previously published molecular absorption feature in the 1.1-1.7 µm bandpass, we detect a distinct absorption fe…
On the Mass Accretion Rate and Infrared Excess in Herbig Ae/Be Stars
Arun, R.; Mathew, Blesson; Manoj, P. +5 more
The present study makes use of the unprecedented capability of the Gaia mission to obtain the stellar parameters such as distance, age, and mass of HAeBe stars. The accuracy of Gaia DR2 astrometry is demonstrated from the comparison of the Gaia DR2 distances of 131 HAeBe stars with the previously estimated values from the literature. This is one o…
WOBBLE: A Data-driven Analysis Technique for Time-series Stellar Spectra
Hogg, David W.; Foreman-Mackey, Daniel; Bedell, Megan +2 more
In recent years, dedicated extreme precision radial velocity (RV) spectrographs have produced vast quantities of high-resolution, high-signal-to-noise (S/N) time-series spectra for bright stars. These data contain valuable information for the dual purposes of planet detection via the measured RVs and stellar characterization via the coadded spectr…
Online Database of Class I Methanol Masers
Ladeyschikov, Dmitry A.; Sobolev, Andrey M.; Bayandina, Olga S.
In this paper, we present a database of class I methanol masers. The compiled information from the available literature provides an open and fast access to the data on class I methanol maser emission, including search, analysis, and visualization of the extensive maser data set. There is information on individual maser components detected with sin…
An Eccentric Massive Jupiter Orbiting a Subgiant on a 9.5-day Period Discovered in the Transiting Exoplanet Survey Satellite Full Frame Images
Henning, Thomas; Torres, Guillermo; Barclay, Thomas +71 more
We report the discovery of TOI-172 b from the Transiting Exoplanet Survey Satellite (TESS) mission, a massive hot Jupiter transiting a slightly evolved G star with a 9.48-day orbital period. This is the first planet to be confirmed from analysis of only the TESS full frame images, because the host star was not chosen as a two-minute cadence target…
Near-resonance in a System of Sub-Neptunes from TESS
Kristiansen, Martti H.; Vanderburg, Andrew; Latham, David W. +78 more
We report the Transiting Exoplanet Survey Satellite detection of a multi-planet system orbiting the V = 10.9 K0 dwarf TOI-125. We find evidence for up to five planets, with varying confidence. Three transit signals with high signal-to-noise ratio correspond to sub-Neptune-sized planets (2.76, 2.79, and 2.94 R ⊕), and we statistically va…
Identifying Exoplanets with Deep Learning. II. Two New Super-Earths Uncovered by a Neural Network in K2 Data
Vanderburg, Andrew; Dattilo, Anne; Bieryla, Allyson +10 more
For years, scientists have used data from NASA’s Kepler Space Telescope to look for and discover thousands of transiting exoplanets. In its extended K2 mission, Kepler observed stars in various regions of the sky all across the ecliptic plane, and therefore in different galactic environments. Astronomers want to learn how the populations of exopla…