Search Publications
The 3D Galactocentric Velocities of Kepler Stars: Marginalizing Over Missing Radial Velocities
Angus, Ruth; Foreman-Mackey, Daniel; Bedell, Megan +3 more
Precise Gaia measurements of positions, parallaxes, and proper motions provide an opportunity to calculate 3D positions and 2D velocities (i.e., 5D phase-space) of Milky Way stars. Where available, spectroscopic radial velocity (RV) measurements provide full 6D phase-space information, however there are now and will remain many stars without RV me…
Coronal and Chromospheric Emission in A-type Stars
Robrade, J.; Schneider, P. C.; Wolk, Scott J. +3 more
Cool stars on the main sequence generate X-rays from coronal activity, powered by a convective dynamo. With increasing temperature, the convective envelope becomes smaller and X-ray emission fainter. We present Chandra/HRC-I observations of four single stars with early A spectral types. Only the coolest star of this sample, τ 3 Eri (T <…
WASP-35 and HAT-P-30/WASP-51: Reanalysis using TESS and Ground-based Transit Photometry
Wang, Xiaobin; Gu, Shenghong; Sun, Leilei +3 more
High-precision transit observations provide excellent opportunities for characterizing the physical properties of exoplanetary systems. These physical properties supply many pieces of information for unvealing the internal structure, external atmosphere, and dynamical history of the planets. We present revised properties of the transiting systems …
A Search for Analogs of KIC 8462852 (Boyajian's Star): A Second List of Candidates
Schmidt, Edward G.
In data from the Kepler mission, the normal F3V star KIC 8462852 (Boyajian's star) was observed to exhibit infrequent dips in brightness that have not been satisfactorily explained. A previous paper reported the first results of a search for other similar stars in a limited region of the sky around the Kepler field. This paper expands on that sear…
The Ancient Globular Clusters of NGC 1291
Chandar, Rupali; Mok, Angus; Hixenbaugh, Kyle
We present a new catalog of 81 ancient globular clusters (GCs) in the early-type spiral (SB0/a) galaxy NGC 1291. Candidates have been selected from B, V, and I band images taken with the Hubble Space Telescope, which also reveal 17 younger (τ ≲ few × 100 Myr) clusters. The luminosity function shows a peaked shape similar to that found for GC syste…
Search for an Alien Message to a Nearby Star
Wright, Jason T.; Gillon, Michaël; Burdanov, Artem
If alien probes have colonized the whole galaxy, they could have formed an efficient galactic-scale communication network by establishing direct gravitationally lensed links between neighboring systems. Under this scenario, observing the positions opposite the nearest ecliptic stars represents a promising artifact SETI strategy that could make it …
Kepler Bonus: Aperture Photometry Light Curves of EXBA Sources
Hedges, Christina; Rodriguez, Joseph E.; Barentsen, Geert +2 more
NASA's Kepler mission observed background regions across its field of view for more than 3 consecutive yr using custom designed superapertures (EXBA masks). Since these apertures were designed to capture a region of the sky rather than single targets, the Kepler Science Data Processing Pipeline produced target pixel files but did not produce light…
Nova Sagittarii 1943 (V1148 Sgr): A Luminous Red Nova?
Bond, Howard E.; Mink, Jessica; Doane, Alison +1 more
Nova Sagittarii 1943 (V1148 Sgr) was an eighth magnitude optical transient that was unusual in having a late-type spectrum during its outburst, in striking contrast to the normal high-excitation spectra seen in classical novae. Unfortunately, only an approximate position was given in the discovery announcement, hampering follow-up attempts to obse…
An ALMA 1.3 millimeter Search for Debris Disks around Solar-type Stars in the Pleiades
MacGregor, Meredith A.; Wilner, David J.; Matthews, Brenda +4 more
Millimeter emission from debris disks around stars of different ages provides constraints on the collisional evolution of planetesimals. We present ALMA 1.3 millimeter observations of a sample of 76 Solar-type stars in the ~115 Myr old Pleiades star cluster. These ALMA observations complement previous infrared observations of this sample by provid…
The Solar Neighborhood L: Spectroscopic Discovery of K Dwarfs Younger Than 1 Gyr and New Binaries within 30 pc
Henry, Todd J.; Paredes, Leonardo A.; Hubbard-James, Hodari-Sadiki +2 more
As part of a comprehensive effort to characterize the nearest stars, the CHIRON echelle spectrograph on the CTIO/SMARTS 1.5 m telescope is being used to acquire high-resolution (R = 80,000) spectra of K dwarfs within 50 pc. This paper provides spectral details about 35 K dwarfs from five benchmark sets with estimated ages spanning 20 Myr-5.7 Gyr. …