Search Publications
The SAPP pipeline for the determination of stellar abundances and atmospheric parameters of stars in the core program of the PLATO mission
Kovalev, Mikhail; Casagrande, Luca; Serenelli, Aldo +25 more
We introduce the SAPP (Stellar Abundances and atmospheric Parameters Pipeline), the prototype of the code that will be used to determine parameters of stars observed within the core program of the PLATO space mission. The pipeline is based on the Bayesian inference and provides effective temperature, surface gravity, metallicity, chemical abundanc…
Clump survival and migration in VDI galaxies: an analytical model versus simulations and observations
Dekel, Avishai; Primack, Joel; Guo, Yicheng +3 more
We address the nature of the giant clumps in high-z galaxies that undergo violent disc instability, distinguishing between long-lived and short-lived clumps. We study the evolution of long-lived clumps during migration through the disc via an analytical model tested by simulations and confront theory with CANDELS-HST observations. The clump 'batht…
Dynamically Tagged Groups of Metal-poor Stars from the Best and Brightest Survey
Huang, Yang; Casey, Andrew R.; Beers, Timothy C. +9 more
Orbital characteristics based on Gaia Early Data Release 3 astrometric parameters are analyzed for ~4000 metal-poor stars ([Fe/H] ≤ -0.8) compiled from the Best and Brightest survey. Selected as metal-poor candidates based on broadband near- and far-IR photometry, 43% of these stars had medium-resolution (1200 ≲ R ≲ 2000) validation spectra obtain…
Still Brighter than Pre-explosion, SN 2012Z Did Not Disappear: Comparing Hubble Space Telescope Observations a Decade Apart
Foley, Ryan J.; Riess, Adam G.; Kirshner, Robert P. +10 more
Type Iax supernovae (SNe Iax) represent the largest class of peculiar white dwarf supernovae. The type Iax SN 2012Z in NGC 1309 is the only white dwarf supernova with a detected progenitor system in pre-explosion observations. Deep Hubble Space Telescope (HST) images taken before SN 2012Z show a luminous, blue source that we have interpreted as a …
HST/WFC3 transmission spectroscopy of the cold rocky planet TRAPPIST-1h
Gillon, M.; Wakeford, H. R.; Lewis, N. K. +4 more
Aims: TRAPPIST-1 is a nearby ultra-cool dwarf star transited by seven rocky planets. We observed three transits of its outermost planet, TRAPPIST-1h, using the G141 grism of the Wide Field Camera 3 instrument aboard the Hubble Space Telescope to place constraints on its potentially cold atmosphere.
Methods: In order to deal with the effe…
Deep ASKAP EMU Survey of the GAMA23 field: properties of radio sources
Prandoni, I.; Marchetti, L.; Vaccari, M. +19 more
We present the Australian Square Kilometre Array Pathfinder (ASKAP) observations of the Galaxy and Mass Assembly (GAMA)-23h field. The survey was carried out at 887.5 MHz and covers an ~83 square deg field. We imaged the calibrated visibility data, taken as part of the Evolutionary Mapping of Universe Early Science Programme, using the latest vers…
TOI-3757 b: A Low-density Gas Giant Orbiting a Solar-metallicity M Dwarf
Kobulnicky, Henry A.; Cochran, William D.; Mahadevan, Suvrath +32 more
We present the discovery of a new Jovian-sized planet, TOI-3757 b, the lowest-density transiting planet known to orbit an M dwarf (M0V). This planet was discovered around a solar-metallicity M dwarf, using Transiting Exoplanet Survey Satellite photometry and confirmed with precise radial velocities from the Habitable-zone Planet Finder (HPF) and N…
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…