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The Single-cloud Star Formation Relation
Henning, Thomas; Myers, Philip C.; Gutermuth, Robert A. +10 more
One of the most important and well-established empirical results in astronomy is the Kennicutt-Schmidt relation between the density of interstellar gas and the rate at which that gas forms stars. A tight correlation between these quantities has long been measured at galactic scales. More recently, using surveys of YSOs, a KS relationship has been …
A scaling relationship for non-thermal radio emission from ordered magnetospheres: from the top of the main sequence to planets
Umana, G.; Fossati, L.; Loru, S. +20 more
In this paper, we present the analysis of incoherent non-thermal radio emission from a sample of hot magnetic stars, ranging from early-B to early-A spectral type. Spanning a wide range of stellar parameters and wind properties, these stars display a commonality in their radio emission which presents new challenges to the wind scenario as original…
GJ 367b: A dense, ultrashort-period sub-Earth planet transiting a nearby red dwarf star
Hellier, Coel; Latham, David W.; Quinn, Samuel N. +75 more
Ultrashort-period (USP) exoplanets have orbital periods shorter than 1 day. Precise masses and radii of USP exoplanets could provide constraints on their unknown formation and evolution processes. We report the detection and characterization of the USP planet GJ 367b using high-precision photometry and radial velocity observations. GJ 367b orbits …
Year 1 of the ZTF high-cadence Galactic plane survey: strategy, goals, and early results on new single-mode hot subdwarf B-star pulsators
Hermes, J. J.; Duev, Dmitry A.; Riddle, Reed +18 more
We present the goals, strategy, and first results of the high-cadence Galactic plane survey using the Zwicky Transient Facility (ZTF). The goal of the survey is to unveil the Galactic population of short-period variable stars, including short-period binaries, and stellar pulsators with periods less than a few hours. Between 2018 June and 2019 Janu…
A major asymmetric ice trap in a planet-forming disk. I. Formaldehyde and methanol
Booth, Alice S.; van Dishoeck, Ewine F.; Leemker, Margot +2 more
Context. The chemistry of planet-forming disks sets the exoplanet atmosphere composition and the prebiotic molecular content. Dust traps are of particular importance as pebble growth and transport are crucial for setting the chemistry where giant planets form.
Aims: The asymmetric Oph IRS 48 dust trap located at 60 au radius provides a unique…
Improved treatment of dark matter capture in white dwarfs
Bell, Nicole F.; Ramirez-Quezada, Maura E.; Busoni, Giorgio +2 more
White dwarfs, the most abundant stellar remnants, provide a promising means of probing dark matter interactions, complimentary to terrestrial searches. The scattering of dark matter from stellar constituents leads to gravitational capture, with important observational consequences. In particular, white dwarf heating occurs due to the energy transf…
The Mega-MUSCLES Spectral Energy Distribution of TRAPPIST-1
Loyd, R. O. Parke; Redfield, Seth; Roberge, Aki +19 more
We present a 5 Å-100 µm spectral energy distribution (SED) of the ultracool dwarf star TRAPPIST-1, obtained as part of the Mega-MUSCLES Treasury Survey. The SED combines ultraviolet and blue-optical spectroscopy obtained with the Hubble Space Telescope, X-ray spectroscopy obtained with XMM-Newton, and models of the stellar photosphere, chrom…
Rest-frame UV spectroscopy of extreme [O III] emitters at 1.3 < z < 3.7: toward a high-redshift UV reference sample for JWST
Charlot, Stéphane; Chevallard, Jacopo; Tang, Mengtao +3 more
Deep spectroscopy of galaxies in the reionization era has revealed intense C III] and C IV line emission (equivalent width, EW >15-20 Å). In order to interpret the nebular emission emerging at z > 6, we have begun targeting rest-frame ultraviolet (UV) emission lines in galaxies with large specific star formation rates (sSFRs) at 1.3 < z &…
The PYRAT BAY framework for exoplanet atmospheric modelling: a population study of Hubble/WFC3 transmission spectra
Cubillos, Patricio E.; Blecic, Jasmina
We present the open-source PYTHON Radiative-transfer in a Bayesian framework (PYRAT BAY) framework for exoplanet atmospheric modelling, spectral synthesis, and Bayesian retrieval. The modular design of the code allows the users to generate atmospheric 1D parametric models of the temperature, abundances (in thermochemical equilibrium or constant-wi…
How much has the Sun influenced Northern Hemisphere temperature trends? An ongoing debate
Henry, Gregory W.; Solheim, Jan-Erik; Scafetta, Nicola +20 more
In order to evaluate how much Total Solar Irradiance (TSI) has influenced Northern Hemisphere surface air temperature trends, it is important to have reliable estimates of both quantities. Sixteen different estimates of the changes in TSI since at least the 19th century were compiled from the literature. Half of these estimates are "low…