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CHEOPS geometric albedo of the hot Jupiter HD 209458 b
Guterman, P.; Alonso, R.; Deleuil, M. +74 more
We report the detection of the secondary eclipse of the hot Jupiter HD 209458 b in optical/visible light using the CHEOPS space telescope. Our measurement of 20.4−3.3+3.2 parts per million translates into a geometric albedo of Ag = 0.096 ± 0.016. The previously estimated dayside temperature of about 1500 K implies …
Jet Parameters in the Black Hole X-Ray Binary MAXI J1820+070
Zdziarski, Andrzej A.; Sikora, Marek; Tetarenko, Alexandra J.
We study the jet in the hard state of the accreting black hole (BH) binary MAXI J1820+070. From the available radio-to-optical spectral and variability data, we put strong constraints on the jet parameters. We find while it is not possible to uniquely determine the jet Lorentz factor from the spectral and variability properties alone, we can estim…
Investigating the Nature of the Luminous Ambiguous Nuclear Transient ASASSN-17jz
Filippenko, Alexei V.; Burgasser, Adam J.; Im, Myungshin +31 more
We present observations of the extremely luminous but ambiguous nuclear transient (ANT) ASASSN-17jz, spanning roughly 1200 days of the object's evolution. ASASSN-17jz was discovered by the All-Sky Automated Survey for Supernovae (ASAS-SN) in the galaxy SDSS J171955.84+414049.4 on UT 2017 July 27 at a redshift of z = 0.1641. The transient peaked at…
HILIGT, upper limit servers I-Overview
Gabriel, C.; Kretschmar, P.; Kuulkers, E. +10 more
The advent of all-sky facilities, such as the Neil Gehrels Swift observatory, the All Sky Automated Search for Supernovae (ASAS-SN), eROSITA and Gaia has led to a new appreciation of the importance of transient sources in solving outstanding astrophysical questions. Identification and catalogue cross-matching of transients has been eased over the …
z 2-9 Galaxies Magnified by the Hubble Frontier Field Clusters. I. Source Selection and Surface Density-Magnification Constraints from >2500 Galaxies
Bouwens, R. J.; Oesch, P.; Illingworth, G. +4 more
We assemble a large comprehensive sample of 2534 z ~ 2, 3, 4, 5, 6, 7, 8, and 9 galaxies lensed by the six clusters from the Hubble Frontier Fields (HFF) program. Making use of the availability of multiple independent magnification models for each of the HFF clusters and alternatively treating one of the models as the "truth," we show that the med…
Very Local Interstellar Medium Revealed by a Complete Solar Cycle of Interstellar Neutral Helium Observations with IBEX
McComas, D. J.; Fuselier, S. A.; Galli, A. +8 more
The IBEX-Lo instrument on board the Interstellar Boundary Explorer (IBEX) mission samples interstellar neutral (ISN) helium atoms penetrating the heliosphere from the very local interstellar medium (VLISM). In this study, we analyze the IBEX-Lo ISN helium observations covering a complete solar cycle, from 2009 through 2020 using a comprehensive un…
The Hough Stream Spotter: A New Method for Detecting Linear Structure in Resolved Stars and Application to the Stellar Halo of M31
Williams, Benjamin F.; Ness, Melissa K.; Ibata, Rodrigo A. +5 more
Stellar streams from globular clusters (GCs) offer constraints on the nature of dark matter and have been used to explore the dark matter halo structure and substructure of our Galaxy. Detection of GC streams in other galaxies would broaden this endeavor to a cosmological context, yet no such streams have been detected to date. To enable such expl…
SpinSpotter : An Automated Algorithm for Identifying Stellar Rotation Periods with Autocorrelation Analysis
Hartigan, Patrick; Oelkers, Ryan J.; Robertson, Paul +2 more
SpinSpotter is a robust and automated algorithm designed to extract stellar rotation periods from large photometric data sets with minimal supervision. Our approach uses the autocorrelation function (ACF) to identify stellar rotation periods up to one-third the observational baseline of the data. Our algorithm also provides a suite of diagnostics …
Bridging the Gap-The Disappearance of the Intermediate Period Gap for Fully Convective Stars, Uncovered by New ZTF Rotation Periods
Angus, Ruth; Curtis, Jason L.; David, Trevor J. +2 more
The intermediate period gap, discovered by Kepler, is an observed dearth of stellar rotation periods in the temperature-period diagram at ~20 days for G dwarfs and up to ~30 days for early-M dwarfs. However, because Kepler mainly targeted solar-like stars, there is a lack of measured periods for M dwarfs, especially those at the fully convective l…
The Mass Scale of High-redshift Galaxies: Virial Mass Estimates Calibrated with Stellar Dynamical Models from LEGA-C
Bell, Eric F.; Maseda, Michael V.; D'Eugenio, Francesco +9 more
Dynamical models for 673 galaxies at z = 0.6-1.0 with spatially resolved (long-slit) stellar kinematic data from LEGA-C are used to calibrate virial mass estimates defined as ${M}_{\mathrm{vir}}=K\sigma {{\prime} }_{\star ,\mathrm{int}}^{2}R$ , with K a scaling factor, $\sigma {{\prime} }_{\star ,\mathrm{int}}$ the spatially integrated stellar vel…