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Constraining Mornings and Evenings on Distant Worlds: A new Semianalytical Approach and Prospects with Transmission Spectroscopy
Espinoza, Néstor; Jones, Kathryn
The technique of transmission spectroscopy-the variation of a planetary radius with wavelength due to opacity sources in the planet's terminator region-has been one of the most successful in the characterization of exoplanet atmospheres to date, providing key insights into the composition and structure of these distant worlds. A common assumption …
AT 2019avd: a novel addition to the diverse population of nuclear transients
Sollerman, J.; Rusholme, B.; Liu, Z. +29 more
We report on SRG/eROSITA, ZTF, ASAS-SN, Las Cumbres, NEOWISE-R, and Swift XRT/UVOT observations of the unique ongoing event AT 2019avd, located in the nucleus of a previously inactive galaxy at z = 0.029. eROSITA first observed AT 2019avd on 2020-04-28 during its first all sky survey, when it was detected as an ultra-soft X-ray source (kT ~ 85 eV)…
Multiphase Powerful Outflows Detected in High-z Quasars
Cappi, M.; Vignali, C.; Dadina, M. +7 more
We present results from a comprehensive study of ultrafast outflows (UFOs) detected in a sample of 14 quasars, 12 of which are gravitationally lensed, in a redshift range of 1.41-3.91, near the peak of the active galactic nucleus (AGN) and star formation activity. New XMM-Newton observations are presented for six of them, which were selected to be…
Revealing Gravitational Collapse in the Serpens G3-G6 Molecular Cloud Using Velocity Gradients
Stanimirović, Snežana; Lazarian, A.; Hu, Yue
The relative role of turbulence, magnetic fields, and self-gravity in star formation is a subject of intensive debate. We present IRAM 30 m telescope observations of the 13CO (1-0) emission in the Serpens G3-G6 molecular cloud and apply to the data a set of statistical methods. These include the probability density functions of column d…
The rocky road to quiescence: compaction and quenching of quasar host galaxies at z ∼ 2
Ivison, R. J.; Vegetti, S.; McKean, J. P. +6 more
We resolve the host galaxies of seven gravitationally lensed quasars at redshift 1.5-2.8 using observations with the Atacama Large (sub)Millimetre Array. Using a visibility plane lens modelling technique, we create pixellated reconstructions of the dust morphology, and CO line morphology and kinematics. We find that the quasar hosts in our sample …
The proper motion of Andromeda from Gaia EDR3: confirming a nearly radial orbit
Reylé, C.; Famaey, B.; Ibata, R. +4 more
We present an analysis of the proper motion of the Andromeda galaxy (M31), based on the Early Third Data Release of the Gaia mission. We use the Gaia photometry to select young blue main-sequence stars and apply several quality cuts to obtain clean samples of these tracers. After correcting the proper motion measurements for the internal rotation …
Limits on Millimeter Continuum Emission from Circumplanetary Material in the DSHARP Disks
Wilner, David J.; Andrews, Sean M.; Huang, Jane +10 more
We present a detailed analysis for a subset of the high-resolution (~35 mas, or 5 au) ALMA observations from the Disk Substructures at High Angular Resolution Project (DSHARP) to search for faint 1.3 mm continuum emission associated with dusty circumplanetary material located within the narrow annuli of depleted emission (gaps) in circumstellar di…
Orbital misalignment of the super-Earth π Men c with the spin of its star
Kunovac Hodžić, Vedad; Triaud, Amaury H. M. J.; Cegla, Heather M. +2 more
Planet-planet scattering events can leave an observable trace of a planet's migration history in the form of orbital misalignment with respect to the stellar spin axis, which is measurable from spectroscopic time-series taken during transit. We present high-resolution spectroscopic transits observed with ESPRESSO of the close-in super-Earth π Men …
The Pristine survey - XII. Gemini-GRACES chemo-dynamical study of newly discovered extremely metal-poor stars in the Galaxy
Sestito, Federico; Navarro, Julio F.; Martin, Nicolas F. +16 more
High-resolution optical spectra of 30 metal-poor stars selected from the Pristine survey are presented, based on observations taken with the Gemini Observatory GRACES spectrograph. Stellar parameters Teff and log g are determined using a Gaia DR2 colour-temperature calibration and surface gravity from the Stefan-Boltzmann equation. GRAC…
Discovery of a directly imaged planet to the young solar analog YSES 2
Mugrauer, Markus; Ginski, Christian; Kenworthy, Matthew A. +8 more
Context. To understand the origin and formation pathway of wide-orbit gas giant planets, it is necessary to expand the limited sample of these objects. The mass of exoplanets derived with spectrophotometry, however, varies strongly as a function of the age of the system and the mass of the primary star.
Aims: By selecting stars with similar a…