Search Publications
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, …
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…