Search Publications
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…
Tempestuous life beyond R500: X-ray view on the Coma cluster with SRG/eROSITA. I. X-ray morphology, recent merger, and radio halo connection
Sunyaev, R.; Churazov, E.; Bykov, A. M. +2 more
This is the first paper in a series of studies of the Coma cluster using the SRG/eROSITA X-ray data obtained in the course of the calibration and performance verification observations. The data cover a ~3° × 3° area around the cluster with a typical exposure time of more than 20 ks. The stability of the instrumental background and operation of the…
Two Contact Binaries with Mass Ratios Close to the Minimum Mass Ratio
Li, Kai; Xia, Qi-Qi; Chen, Xu +5 more
The cutoff mass ratio is under debate for contact binaries. In this paper, we present the investigation of two contact binaries with mass ratios close to the low mass ratio limit. It is found that the mass ratios of VSX J082700.8+462850 (hereafter J082700) and 1SWASP J132829.37+555246.1 (hereafter J132829) are both less than 0.1 (q ~ 0.055 for J08…
Constraints on the presence of platinum and gold in the spectra of the kilonova AT2017gfo
Smartt, S. J.; Sim, S. A.; Gillanders, J. H. +2 more
Binary neutron star mergers are thought to be one of the dominant sites of production for rapid neutron capture elements, including platinum and gold. Since the discovery of the binary neutron star merger GW170817, and its associated kilonova AT2017gfo, numerous works have attempted to determine the composition of its outflowing material, but they…
Milky Way Tomography with the SkyMapper Southern Survey. II. Photometric Recalibration of SMSS DR2
Huang, Yang; Ting, Yuan-Sen; Beers, Timothy C. +13 more
We apply the spectroscopy-based stellar-color regression (SCR) method to perform an accurate photometric recalibration of the second data release from the SkyMapper Southern Survey (SMSS DR2). From comparison with a sample of over 200,000 dwarf stars with stellar atmospheric parameters taken from GALAH+ DR3 and with accurate, homogeneous photometr…