Search Publications
Color Dependence of the Transit Detectability of Young Active M Dwarfs
Gaidos, Eric; Miyakawa, Kohei; Hirano, Teruyuki +2 more
We investigate the planetary transit detectability in the presence of stellar rotational activity from light curves of young M dwarfs, and estimate the improvements in detection at near-infrared (NIR) wavelengths. By making maps of the transit signal detection efficiency over the orbital period and planetary radius with light curves of the members…
Improvements to Pan-STARRS1 Astrometry. II. Corrections for Differential Chromatic Refraction
White, Richard L.; Shiao, Bernie; Lubow, Stephen H.
In a previous paper, we applied the Gaia DR2 catalog to improve the astrometric accuracy of about 1.7 billion objects in Pan-STARRS1 Data Release 2 (PS1 DR2). We report here on further improvements made by utilizing Gaia EDR3 and correcting for the effects of differential chromatic refraction (DCR) in decl. We extend the correction algorithm in Pa…
Searching for Diamagnetic Blob Accretion in the 74 day K2 Observation of V2400 Ophiuchi
Garnavich, Peter; Littlefield, Colin; Szkody, Paula +3 more
Since its discovery in 1995, V2400 Ophiuchi (V2400 Oph) has stood apart from most known intermediate polar cataclysmic variables due to its proposed magnetic field strength (9-27 MG) and diskless accretion. To date, the exact accretion mechanism of the system is still unknown, and standard accretion models fail to accurately predict the peculiar b…
Blackbody Temperature of 200+ Stellar Flares Observed with the CoRoT Satellite
Rabello Soares, M. Cristina; de Freitas, Marcia C.; Ferreira, Bernardo P. L.
We estimated blackbody temperature for 209 flares observed at 69 F-K stars, significantly increasing the number of flare temperature determinations. We used the Blue and Red channels obtained by the 27 cm telescope of the CoRoT satellite at high cadence and long duration. The wavelength limits of the channels were estimated using spectra from the …
The Shellless Supernova Remnant B0532-67.5 in the Large Magellanic Cloud
Chu, You-Hua; Li, Chuan-Jui; Chuang, Chen-Yu +1 more
The supernova remnant (SNR) B0532-67.5 in the Large Magellanic Cloud (LMC) was first diagnosed by its nonthermal radio emission, and its SNR nature was confirmed by the observation of diffuse X-ray emission; however, no optical SNR shell is detected. The OB association LH75, or NGC 2011, is projected within the boundary of this SNR. We have analyz…
The Discovery of New Binary Systems Using Value-added Catalogs and TESS Data
Carrell, Kenneth; Gray Cherry, Jackie; Gillespie, Charles
Using potentially variable sources flagged in value-added catalogs created by combining data from the Gaia, IPHAS, and KIS surveys, we utilized data from TESS, McDonald Observatory, and the Southern Plains Private Observatory to confirm and identify four of these potentially variable sources as eclipsing binaries. Combining large data sets and obt…
OGLE-2017-BLG-1038: A Possible Brown-dwarf Binary Revealed by Spitzer Microlensing Parallax
Han, Cheongho; Udalski, Andrzej; Lee, Chung-Uk +38 more
We report the analysis of microlensing event OGLE-2017-BLG-1038, observed by the Optical Gravitational Lensing Experiment, Korean Microlensing Telescope Network, and Spitzer telescopes. The event is caused by a giant source star in the Galactic Bulge passing over a large resonant binary-lens caustic. The availability of space-based data allows the…
Hubble Space Telescope STIS Spectroscopy of Nova T Aurigae 1891
Sion, Edward M.; Godon, Patrick; Larsen, Conor
T Aurigae is an eclipsing old nova that exploded in 1891. At a Gaia EDR3 distance of 815-871 pc, it is a relatively nearby old nova. Through ultraviolet spectral modeling and using the new precise Gaia distance, we find that the HST/STIS spectrum of T Aurigae is consistent with an accretion disk with a mass-transfer rate $\dot{M}$ of the order of …
Constraining the Planet Occurrence Rate around Halo Stars of Potentially Extragalactic Origin
Price-Whelan, Adrian M.; Yoshida, Stephanie; Grunblatt, Samuel
The search for planets orbiting other stars has recently expanded to include stars from galaxies outside the Milky Way. With the Transiting Exoplanet Survey Satellite (TESS) and Gaia surveys, photometric and kinematic information can be combined to identify transiting planet candidates of extragalactic origin. Here, 1080 low-luminosity red-giant b…
BD+47 378: An Eclipsing Binary Containing a δ Sct Pulsating Star
Han, Cheongho; Hong, Kyeongsoo; Rittipruk, Pakakaew +3 more
New high-resolution spectra of the eclipsing binary BD+47 378 were obtained on five nights between 2020 and 2021 with the Bohyunsan Observatory Echelle Spectrograph in Korea. We collected the TESS light curve of the system obtained from Sectors 17 to 18, which shows a flat bottom at the secondary eclipse, an O'Connell effect, and oscillation featu…