Search Publications
Sulfur Chemistry in Protoplanetary Disks: CS and H2CS
Bergner, Jennifer B.; Le Gal, Romane; Loomis, Ryan A. +2 more
The nature and abundance of sulfur chemistry in protoplanetary disks (PPDs) may impact the sulfur inventory on young planets and therefore their habitability. PPDs also offer an interesting test bed for sulfur chemistry models, since each disk shows a diverse set of environments. In this context, we present new sulfur molecule observations in PPDs…
Follow-up of the Neutron Star Bearing Gravitational-wave Candidate Events S190425z and S190426c with MMT and SOAR
Reichart, D. E.; Berger, E.; Chornock, R. +23 more
On 2019 April 25.346 and 26.640 UT the Laser Interferometer Gravitational-Wave Observatory (LIGO) and Virgo gravitational-wave (GW) observatory announced the detection of the first candidate events in Observing Run 3 that contained at least one neutron star (NS). S190425z is a likely binary neutron star (BNS) merger at d L = 156 ± 41 …
Exoplanet atmospheres with GIANO. II. Detection of molecular absorption in the dayside spectrum of HD 102195b
Sozzetti, A.; Giacobbe, P.; Bonomo, A. S. +4 more
Context. The study of exoplanetary atmospheres is key to understanding the differences between their physical, chemical, and dynamical processes. Until now, the bulk of atmospheric characterization analyses have been conducted on transiting planets. On a number of sufficiently bright targets, high-resolution spectroscopy (HRS) has also been succes…
A 5D view of the α Per, Pleiades, and Praesepe clusters
Smart, R. L.; Lodieu, N.; Pérez-Garrido, A. +1 more
Aims: Our scientific goal is to provide revised membership lists of the α Per, Pleiades, and Praesepe clusters exploiting the second data release of Gaia and produce five-dimensional maps (α, δ, π, µα cos δ, µδ) of these clusters.
Methods: We implemented the kinematic method combined with the statistical…
Constraints on a Bianchi type I spacetime extension of the standard Λ CDM model
Kumar, Suresh; Akarsu, Özgür; Sharma, Shivani +1 more
We consider the simplest anisotropic generalization, as a correction, to the standard Λ CDM model, by replacing the spatially flat Robertson-Walker metric by the Bianchi type-I metric, which brings in a new term Ωσ 0a-6 (mimicking the stiff fluid) in the average expansion rate H (a ) of the Universe. From Hubble and Pantheon …
Prompt Emission Polarimetry of Gamma-Ray Bursts with the AstroSat CZT Imager
Rao, A. R.; Bhalerao, Varun; Mate, Sujay +10 more
X-ray and gamma-ray polarization measurements of the prompt emission of gamma-ray bursts (GRBs) are believed to be extremely important for testing various models of GRBs. So far, the available measurements of hard X-ray polarization of GRB prompt emission have not significantly constrained the GRB models, particularly because of the difficulty of …
Ellerman bombs and UV bursts: transient events in chromospheric current sheets
Carlsson, M.; Pereira, T. M. D.; Hansteen, V. +3 more
Context. Ellerman bombs (EBs), observed in the photospheric wings of the Hα line, and UV bursts, observed in the transition region Si IV line, are both brightenings related to flux emergence regions and specifically to magnetic flux of opposite polarity that meet in the photosphere. These two reconnection-related phenomena, nominally formed far ap…
The ALMA Fornax Cluster Survey I: stirring and stripping of the molecular gas in cluster galaxies
de Looze, Ilse; Baes, Maarten; Bendo, George J. +15 more
We present the first results of the ALMA Fornax Cluster Survey: a complete ALMA survey of all members of the Fornax galaxy cluster that were detected in H I or in the far-infrared with Herschel. The sample consists of a wide variety of galaxy types, ranging from giant ellipticals to spiral galaxies and dwarfs, located in all (projected) areas of t…
Gas flow and accretion via spiral streamers and circumstellar disks in a young binary protostar
Caselli, P.; Segura-Cox, D.; Zhao, B. +4 more
The majority of stars are part of gravitationally bound stellar systems, such as binaries. Observations of protobinary systems constrain the conditions that lead to stellar multiplicity and subsequent orbital evolution. We report high-angular resolution observations of the circumbinary disk around [BHB2007] 11, a young binary protostar system. The…
The Gas-Star Formation Cycle in Nearby Star-forming Galaxies. I. Assessment of Multi-scale Variations
Kruijssen, J. M. Diederik; Rosolowsky, Erik; Chevance, Mélanie +21 more
The processes regulating star formation in galaxies are thought to act across a hierarchy of spatial scales. To connect extragalactic star formation relations from global and kiloparsec-scale measurements to recent cloud-scale resolution studies, we have developed a simple, robust method that quantifies the scale dependence of the relative spatial…