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An Energy Inventory of Tidal Disruption Events
Ramirez-Ruiz, Enrico; Mockler, Brenna
Tidal disruption events (TDEs) offer a unique opportunity to study a single supermassive black hole (SMBH) under feeding conditions that change over timescales of days to months. However, the primary mechanism for generating luminosity during the flares remains debated. Despite the increasing number of observed TDEs, it is unclear whether most of …
Curlometer Technique and Applications
Eastwood, J. P.; Dunlop, M. W.; Shen, C. +9 more
We review the range of applications and use of the curlometer, initially developed to analyze Cluster multi-spacecraft magnetic field data; but more recently adapted to other arrays of spacecraft flying in formation, such as MMS small-scale, 4-spacecraft configurations; THEMIS close constellations of 3-5 spacecraft, and Swarm 2-3 spacecraft config…
The ZTF Source Classification Project - II. Periodicity and variability processing metrics
Duev, Dmitry A.; Riddle, Reed; Mróz, Przemek +22 more
The current generation of all-sky surveys is rapidly expanding our ability to study variable and transient sources. These surveys, with a variety of sensitivities, cadences, and fields of view, probe many ranges of time-scale and magnitude. Data from the Zwicky Transient Facility (ZTF) yields an opportunity to find variables on time-scales from mi…
The census of dense cores in the Serpens region from the Herschel Gould Belt Survey
Arzoumanian, D.; Könyves, V.; Bontemps, S. +13 more
The Herschel Gould Belt survey mapped the nearby (d < 500 pc) star-forming regions to understand better how the prestellar phase influences the star formation process. Here, we report a complete census of dense cores in a ~15 deg2 area of the Serpens star-forming region located between d ~ 420 and 484 pc. The PACS and SPIRE cameras i…
Spectroscopic study of CEMP-(s & r/s) stars. Revisiting classification criteria and formation scenarios, highlighting i-process nucleosynthesis
Goswami, Aruna; Goswami, Partha Pratim; Rathour, Rajeev Singh
Context. The origin of the enhanced abundances of both s- and r-process elements observed in a subclass of carbon-enhanced metal-poor (CEMP) stars, denoted CEMP-r/s stars, still remains poorly understood. The i-process nucleosynthesis has been suggested as one of the most promising mechanisms for the origin of these stars.
Aims: Our aim is to…
Day-night differences in Mars methane suggest nighttime containment at Gale crater
Atreya, Sushil K.; Vasavada, Ashwin R.; Moores, John E. +10 more
We report new measurements of atmospheric methane by the Curiosity rover's Tunable Laser Spectrometer that is part of the Sample Analysis at Mars suite (TLS-SAM), finding nondetections during two daytime measurements of average value 0.05 ± 0.22 ppbv (95% confidence interval CI). These are in marked contrast with nighttime background levels of 0.5…
Refined physical parameters for Chariklo's body and rings from stellar occultations observed between 2013 and 2020
Colas, F.; Bérard, D.; Snodgrass, C. +78 more
Context. The Centaur (10199) Chariklo has the first ring system discovered around a small object. It was first observed using stellar occultation in 2013. Stellar occultations allow sizes and shapes to be determined with kilometre accuracy, and provide the characteristics of the occulting object and its vicinity.
Aims: Using stellar occultati…
Jets from young stars
Ray, T. P.; Ferreira, J.
Jets are ubiquitous in the Universe and are seen from a large number of astrophysical objects including active galactic nuclei, gamma ray bursters, micro-quasars, proto-planetary nebulae, young stars and even brown dwarfs. In every case they seem to be accompanied by an accretion disk and, while the detailed physics may change, it has been suggest…
The Gaia DR2 halo white dwarf population: the luminosity function, mass distribution, and its star formation history
Rebassa-Mansergas, Alberto; Raddi, Roberto; Torres, Santiago +1 more
We analyse the volume-limited nearly complete 100 pc sample of 95 halo white dwarf candidates identified by the second data release of Gaia. Based on a detailed population synthesis model, we apply a method that relies on Gaia astrometry and photometry to accurately derive the individual white dwarf parameters. This method is tested with 25 white …
Improved Constraints on the Initial-to-final Mass Relation of White Dwarfs Using Wide Binaries
Chanamé, Julio; Barrientos, Manuel
We present observational constraints for the initial-to-final mass relation (IFMR) derived from 11 white dwarfs (WDs) in wide binaries (WBs) that contain a turnoff/subgiant primary. Because the components of WBs are coeval to a good approximation, the age of the WD progenitor can be determined from the study of its wide companion. However, previou…