Search Publications
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. …
Solar Coronal Mass Ejections Plasma Diagnostics Expressed as Potential Stellar CME Signatures
Raymond, John C.; Wilson, Maurice L.
Solar coronal mass ejections (CMEs) have a strong association with solar flares that is not fully understood. This characteristic of our Sun's magnetic activity may also occur on other stars, but the lack of successfully detected stellar CMEs makes it difficult to perform statistical studies that might show a similar association between CMEs and f…
The Nearby Dwarf Irregular Galaxy IC 1613 and Its Complex Bubble Region: Chandra and VLA Observations
Schlegel, E. M.; Pannuti, Thomas G.; Moiseev, A. +2 more
We observed the nearby irregular galaxy IC 1613 with the Chandra X-ray Observatory, for 49.9 ks using the ACIS S3 chip, and with the VLA at 6 cm for 0.7 hr. The Chandra observation targeted the extensive bubble region in the northeast quadrant. We detect 31 sources within the D 25 diameter above a significance of 3σ corresponding to a p…
A Photometric and Spectroscopic Study of the Short-period Algol EW Boötis with a δ Sct Pulsator
Hong, Kyeongsoo; Lee, Jae Woo; Kim, Chun-Hwey +4 more
In this paper, we present Transiting Exoplanet Survey Satellite (TESS) photometry and high-resolution spectra of the short-period Algol EW Boo. We obtained double-lined radial velocities (RVs) from the time-series spectra and measured the effective temperature of the primary star as T eff,1 = 8560 ± 118 K. For the orbital period study, …