Search Publications
A Second Look at 12 Candidate Dual AGNs Using BAYMAX
Greene, Jenny E.; Comerford, Julia M.; Barrows, R. Scott +5 more
We present an analysis of 12 optically selected dual active galactic nucleus (AGN) candidates at z < 0.34. Each candidate was originally identified via double-peaked [O III] λ5007 emission lines and received follow-up Chandra and Hubble Space Telescope (HST) observations. Because the X-ray data are low-count (<100 counts) with small separati…
NGTS-10b: the shortest period hot Jupiter yet discovered
Smalley, Barry; Jackman, James A. G.; Wheatley, Peter J. +44 more
We report the discovery of a new ultrashort period (USP) transiting hot Jupiter from the Next Generation Transit Survey (NGTS). NGTS-10b has a mass and radius of 2.162 ^{+0.092}_{-0.107} MJ and 1.205 ^{+0.117}_{-0.083} RJ and orbits its host star with a period of 0.7668944 ± 0.0000003 d, making it the shortest period hot Jupi…
The Lyman Continuum Escape Fraction of Galaxies and AGN in the GOODS Fields
Koekemoer, Anton M.; Conselice, Christopher J.; Hathi, Nimish +13 more
We present our analysis of the Lyman continuum (LyC) emission and escape fraction of 111 spectroscopically verified galaxies with and without active galactic nuclei (AGN) from 2.26 < z < 4.3. We extended our ERS sample from Smith et al. with 64 galaxies in the GOODS North and South fields using WFC3/UVIS F225W, F275W, and F336W mosaics we in…
Microlensing Optical Depth and Event Rate in the OGLE-IV Galactic Plane Fields
Udalski, Andrzej; Mróz, Przemek; Szymański, Michał K. +10 more
Searches for gravitational microlensing events are traditionally concentrated on the central regions of the Galactic bulge but many microlensing events are expected to occur in the Galactic plane, far from the Galactic Center. Owing to the difficulty in conducting high-cadence observations of the Galactic plane over its vast area, which are necess…
The Chemical Signatures of Planetary Engulfment Events in Binary Systems
Nagar, Tushar; Spina, Lorenzo; Karakas, Amanda I.
Planetary engulfment events involve the chemical assimilation of a planet into a star’s external layer. This can cause a change in the chemical pattern of the stellar atmosphere in a way that mirrors the composition of the rocky object engulfed, with the refractory elements being more abundant than the volatiles. Due to these stellar chemical chan…
HATS-71b: A Giant Planet Transiting an M3 Dwarf Star in TESS Sector 1
Kim, J.; Butler, R. P.; Winn, J. N. +41 more
We report the discovery of HATS-71b, a transiting gas giant planet on a $P=3.7955$ day orbit around a $G=15.35$ mag M3 dwarf star. HATS-71 is the coolest M dwarf star known to host a hot Jupiter. The loss of light during transits is 4.7%, more than in any other confirmed transiting planet system. The planet was identified as a candidate by the gro…
An Investigation of Poorly Studied Open Cluster NGC 4337 Using Multicolor Photometric and Gaia DR2 Astrometric Data
Bisht, D.; Rangwal, Geeta; Yadav, R. K. S. +5 more
We present a comprehensive analysis (photometric and kinematical) of the poorly studied open cluster NGC 4337 using 2MASS, WISE, APASS, and Gaia DR2 databases. By determining the membership probabilities of stars, we identified the 624 most probable members with membership probability higher than 50% by using proper motion and parallax data taken …
Two Major Constraints on the Inner Radii of Accretion Disks
Zdziarski, Andrzej A.; De Marco, Barbara
The Stefan-Boltzmann law yields a fundamental constraint on the geometry of inner accretion disks in black hole X-ray binaries. It follows from considering the irradiating flux and the effective temperature of the inner parts of the disk, which implies that a strong quasi-thermal component with the average energy higher than that of a blackbody at…
TESS Reveals a Short-period Sub-Neptune Sibling (HD 86226c) to a Known Long-period Giant Planet
Butler, R. Paul; Torres, Guillermo; Barclay, Thomas +44 more
The Transiting Exoplanet Survey Satellite mission was designed to find transiting planets around bright, nearby stars. Here, we present the detection and mass measurement of a small, short-period (≈4 days) transiting planet around the bright (V = 7.9), solar-type star HD 86226 (TOI-652, TIC 22221375), previously known to host a long-period (∼1600 …
Discovery of the Optical Afterglow and Host Galaxy of Short GRB 181123B at z = 1.754: Implications for Delay Time Distributions
Cenko, S. B.; Berger, E.; Cucchiara, A. +19 more
We present the discovery of the optical afterglow and host galaxy of the Swift short-duration gamma-ray burst (SGRB) GRB 181123B. Observations with Gemini-North starting ≈9.1 hr after the burst reveal a faint optical afterglow with i ≈ 25.1 mag at an angular offset of 0"59 ± 0"16 from its host galaxy. Using grizYJHK observations, we measure a phot…