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Detection of Na and K in the Atmosphere of the Hot Jupiter HAT-P-1b with P200/DBSP
Wang, Hongchi; van Boekel, Roy; Chen, Guo +1 more
We present a new optical transmission spectrum of the hot Jupiter HAT-P-1b based on two transits observed with the Double Spectrograph (DBSP) on the Palomar 200-inch (P200) telescope. The DBSP transmission spectrum, covering a wavelength range from 3250 to 10007 Å, is consistent with that observed with the Hubble Space Telescope (HST), but the for…
Search for OB associations in Gaia Early Data Release 3
de Grijs, Richard; Chemel, Alexander A.; Glushkova, Elena V. +1 more
The distribution of young stars into OB associations has long been in need of updating. High-precision Gaia Early Data Release 3 astrometry, coupled with modern machine-learning methods, allows this to be done. We have compiled a well-defined sample which includes OB stars and young open clusters (OCs), in total comprising about 47 700 objects. To…
Luminous Optical and X-Ray Flaring of the Putative Redback Millisecond Pulsar 1FGL J0523.5-2529
Perez, Karen I.; Bogdanov, Slavko; Halpern, Jules P.
Several redback and black widow millisecond pulsar binaries have episodes of flaring in X-rays and optical. We initially detected such behavior from the Fermi selected redback candidate 1FGL J0523.5-2529 during optical time-series monitoring. Triggered observations with the Neil Gehrels Swift Observatory over the next ≈100 days showed episodic fla…
A Comprehensive Study of Five Intermediate-age Pismis (2, 3, 7, 12, 15) Clusters Using Photometric and Astrometric Data from Gaia EDR3
Bisht, D.; Rangwal, Geeta; Yadav, R. K. S. +5 more
Open clusters are groups of stars that form simultaneously; hence, these are excellent probes to test theories of star formation, stellar evolution, and dynamics in the Milky Way disk. We carry out a detailed photometric and kinematic study of five poorly studied intermediate-age open clusters, Pismis 2 (Pi 2), Pismis 3 (Pi 3), Pismis 7 (Pi 7), Pi…
Pulsating subdwarf B stars in the oldest open cluster NGC 6791
Reed, M. D.; Pelisoli, I.; Németh, P. +6 more
We report results of our analysis of the Kepler superaperture LC data of the open cluster NGC 6791 to search for pulsating sdB stars. We checked all pixels and we found only three sdB stars to be pulsating, KIC 2569576 (B3), KIC 2438324 (B4), and KIC 2437937 (B5). These stars were known to be pulsators before, though we extended data coverage dete…
The Fast Evolving, Tremendous Blue Superoutburst in ASASSN-21au Reveals a Dichotomy in the Outbursts of Long-period AM CVns
Heinke, C. O.; Cavecchi, Y.; Vanmunster, T. +4 more
ASASSN-21au is an ultracompact accreting white dwarf binary (AM CVn type) with a period of ~58 minutes. Using multiwavelength observations of the system, we discovered a dichotomy in the behavior of outbursts in AM CVns. The binary showed an initial increase in brightness that lasted for at least 82 days, followed by an additional increase that la…
The Properties of Fast Yellow Pulsating Supergiants: FYPS Point the Way to Missing Red Supergiants
Davenport, James R. A.; Dorn-Wallenstein, Trevor Z.; Levesque, Emily M. +3 more
Fast yellow pulsating supergiants (FYPS) are a recently discovered class of evolved massive pulsators. As candidate supergiant objects, and one of the few classes of pulsating evolved massive stars, these objects have incredible potential to change our understanding of the structure and evolution of massive stars. Here we examine the lightcurves o…
Optical and Near-infrared Excesses are Correlated in T Tauri Stars
Kraus, Adam L.; Sullivan, Kendall
Accretion is one of the defining characteristics of classical T Tauri stars, fueled by the presence of a circumstellar disk comprised of dust and gas. Accretion produces a UV and optical excess, while re-radiated emission at the inner edge of the dust component of the disk produces a near-infrared (NIR) excess. The interplay between stars and thei…
Detection of 125.5-day optical periodic modulation of the neutron star M51 ULX-8
Allak, S.
Studying Ultraluminous X-ray sources (ULXs) in the optical wavelengths provides important clues about the accretion mechanisms and the evolutionary processes of X-ray binary systems. In this study, three (C1, C2, and C3) possible optical counterparts were identified for well-known neutron star (NS) candidate M51 ULX-8 through advanced astrometry b…
New candidates for magnetar counterparts from a deep search with the Hubble Space Telescope
Lyman, J. D.; Kouveliotou, C.; Fruchter, A. S. +5 more
We report the discovery of six new magnetar counterpart candidates from deep near-infrared Hubble Space Telescope (HST) imaging. The new candidates are among a sample of 19 magnetars for which we present HST data obtained between 2018 and 2020. We confirm the variability of previously established near-infrared counterparts, and newly identify cand…