Tag: Astronomy and Astrophysical Research
High-mass companions can widen common-envelope outcomes in giant stars
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in AstrophysicsWhat the study found The study found that higher companion mass ratios can produce wider orbits after a common-envelope event, which is an episode where two stars share a single outer envelope. Even so, the widest separation predicted here was still only about 50 solar radii, smaller than the observed range. Why the authors say…
Collapsar model can match some kilonova-like bursts
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in AstrophysicsWhat the study found The authors report that recent kilonova-like emission after long-duration gamma-ray bursts, including GRB 211211A and GRB 230307A, can be explained by a collapsar scenario rather than only by a merger of two neutron stars. Why the authors say this matters The study suggests that a red evolution in these transients does…
BAGLE adds binary lens and source models for microlensing
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in AstrophysicsWhat the study found The BAGLE Python software package now includes models for binary sources and binary lenses in gravitational microlensing. These models include Keplerian orbits, as well as simpler descriptions of orbital motion such as acceleration, linear, or stationary motion of the secondary companion. Why the authors say this matters The authors say these…
Cluster stellar mass growth is mostly established by redshift 0.8
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in AstronomyWhat the study found The study found that, in a sample of massive galaxy clusters, the characteristic stellar mass in the cluster stellar mass function evolves only slightly from redshift 0.8 to 0.55, and that most measurable growth happens between redshift 0.55 and 0.2. The authors also report evidence that the stellar mass fraction in…
LMC corona measurements favor a first-passage orbit
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in AstrophysicsWhat the study found The study found that the Large Magellanic Cloud’s (LMC’s) gaseous halo, or corona, is more consistent with a first-passage orbital model than a second-passage model. In the authors’ simulations, the first-passage case matched the observed present-day velocity and column density profiles more closely. Why the authors say this matters The authors…
Changing-look AGNs appear to be typical host-galaxy systems
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in AstrophysicsWhat the study found The study found that changing-look active galactic nuclei, or CL-AGNs, in this sample generally look like ordinary AGN host systems rather than a separate class. Their black holes roughly follow the same scaling relations seen in inactive galaxies, and their host-galaxy properties do not appear different from those of type 2…
NUV-blue spirals show star-forming outer disks
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in AstronomyStudy reveals why optically red spiral galaxies show ultraviolet-blue colors: quenched centers with active outer disks sustained by fresh gas accretion or galaxy interactions.
VLBI and Gaia agree on many long-period variable star distances
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in AstronomyCompare VLBI and Gaia DR3 astrometric measurements of 43 long period variable stars, revealing complementary strengths for determining stellar distances and proper motions across different.
SDSS-V catalogs Milky Way halo stars with new parameter pipeline
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in AstronomySDSS-V all-sky spectroscopic survey produces validated stellar parameter catalog enabling discovery of distant halo substructures and chemically peculiar stars across the Milky Way.
Deep Chandra observations of a relaxed z = 1.16 galaxy cluster
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in AstrophysicsChandra X-ray observations of SPT-CL J2215-3537 resolve the cool core of this z = 1.16 relaxed galaxy cluster, establishing a high-redshift benchmark for cluster evolution studies.
