Search Publications
Phase-curve Pollution of Exoplanet Transit Depths
Lagage, Pierre-Olivier; Morello, Giuseppe; Cossou, Christophe +2 more
The next generation of space telescopes will enable transformative science to understand the nature and origin of exoplanets. In particular, transit spectroscopy will reveal the chemical composition of the exoplanet atmospheres with unprecedented detail thanks to precise measurements of the visible-to-infrared transit depths down to 10 parts per m…
WIYN Open Cluster Study LXXIX. M48 (NGC 2548) I. Radial Velocities, Rotational Velocities, and Metallicities of Stars in the Open Cluster M48 (NGC 2548)
Twarog, Bruce A.; Anthony-Twarog, Barbara J.; Deliyannis, Constantine P. +2 more
WIYN/Hydra spectra (R ∼ 13,500, signal-to-noise pixel-1 = 50-1000) of a 400 Å region around Li 6708 Å are used to determine radial and rotational velocities for 287 photometrically selected candidate members of the open cluster M48. The sample ranges from turnoff A stars to late-K dwarfs and eight giants. We combine our VRAD …
A Statistical Search for Star-Planet Interaction in the Ultraviolet Using GALEX
Mathew, Blesson; Manoj, P.; Kartha, Sreeja S. +2 more
Most (∼82%) of the over 4000 confirmed exoplanets known today orbit very close to their host stars, within 0.5 au. Planets at such small orbital distances can result in significant interactions with their host stars, which can induce increased activity levels in them. In this work, we have searched for statistical evidence for star-planet interact…
Periodic Eruptive Variability of the Isolated Pre-main-sequence Star V347 Aurigae
Hillenbrand, L. A.; Dahm, S. E.
V347 Aurigae is associated with the small dark cloud L1438 and appears to be an isolated pre-main-sequence star located at distance d ≈ 200 pc. Multi-epoch, archival photometry reveals periodic brightness variations with amplitude V ≈ 2.0 mag occurring on timescales of ∼160 days that have persisted for decades. Regular-cadence, optical imaging of …
TOI 564 b and TOI 905 b: Grazing and Fully Transiting Hot Jupiters Discovered by TESS
Trifonov, Trifon; Batalha, Natalie M.; Latham, David W. +54 more
We report the discovery and confirmation of two new hot Jupiters discovered by the Transiting Exoplanet Survey Satellite (TESS): TOI 564 b and TOI 905 b. The transits of these two planets were initially observed by TESS with orbital periods of 1.651 and 3.739 days, respectively. We conducted follow-up observations of each system from the ground, i…
Orbits of Five Triple Stars
Latham, David W.; Tokovinin, Andrei
Joint analysis of radial velocities and position measurements of five hierarchical stellar systems is undertaken to determine elements of their inner and outer orbits and, whenever possible, their mutual inclinations. The inner and outer periods are 12.9 and 345 yr for HD 12376 (ADS 1613), 1.14 and ∼1500 yr for HD 19971 (ADS 2390), 8.3 and 475 yr …
Near-infrared Census of RR Lyrae Variables in the Messier 3 Globular Cluster and the Period-Luminosity Relations
Herczeg, Gregory J.; de Grijs, Richard; Rejkuba, Marina +4 more
We present new near-infrared (NIR), JHKs, time-series observations of RR Lyrae variables in the Messier 3 (NGC 5272) globular cluster using the WIRCam instrument at the 3.6 m Canada-France-Hawaii Telescope. Our observations cover a sky area of ∼21' × 21' around the cluster center and provide an average of 20 epochs of homogeneous JHK
A Gas Giant Planet in the OGLE-2006-BLG-284L Stellar Binary System
Udalski, Andrzej; Mróz, Przemek; Szymański, Michał K. +34 more
We present the analysis of microlensing event OGLE-2006-BLG-284, which has a lens system that consists of two stars and a gas giant planet with a mass ratio of qp = (1.26 ± 0.19) × 10-3 to the primary. The mass ratio of the two stars is qs = 0.289 ± 0.011, and their projected separation is ss = 2.1 ± 0.7…
Variability in the Massive Open Cluster NGC 1817 from K2: A Rich Population of Asteroseismic Red Clump, Eclipsing Binary, and Main-sequence Pulsating Stars
Vanderburg, Andrew; Stello, Dennis; Grundahl, Frank +13 more
We present a survey of variable stars detected in K2 Campaign 13 within the massive intermediate-age (∼1 Gyr) open cluster NGC 1817. We identify a complete sample of 44 red clump stars in the cluster, and have measured asteroseismic quantities (νmax and/or Δν) for 29 of them. Five stars showed suppressed dipole modes, and the occurrence…
TIC 278956474: Two Close Binaries in One Young Quadruple System Identified by TESS
Borkovits, Tamás; Hellier, Coel; Latham, David W. +25 more
We have identified a quadruple system with two close eclipsing binaries in Transiting Exoplanet Survey Satellite (TESS) data. The object is unresolved in Gaia and appears as a single source at parallax 1.08 ± 0.01 mas. Both binaries have observable primary and secondary eclipses and were monitored throughout TESS Cycle 1 (sectors 1-13), falling wi…