Glidden, Ana Seager, Sara Huang, Jingcheng Petkowski, Janusz J. Ranjan, Sukrit
Published in
The Astrophysical Journal
The search for signs of life on other worlds has largely focused on terrestrial planets. Recent work, however, argues that life could exist in the atmospheres of temperate sub-Neptunes. Here we evaluate the usefulness of carbon dioxide isotopologues as evidence of aerial life. Carbon isotopes are of particular interest, as metabolic processes prefe...
Bengyat, Ofek Gal-Yam, Avishay
Published in
The Astrophysical Journal
A quantitative data-driven comparison among supernovae (SNe) based on their spectral time series combined with multiband photometry is presented. We use an unsupervised random forest algorithm as a metric on a set of 82 well-documented SNe representing all the main spectroscopic types, in order to embed these in an abstract metric space reflecting ...
Bolmont, Julien Caroff, Sami Gaug, Markus Gent, Alasdair Jacholkowska, Agnieszka Kerszberg, Daniel Levy, Christelle Lin, Tony Martinez, Manel Nogués, Leyre
...
Published in
The Astrophysical Journal
Gamma-ray astronomy has become one of the main experimental ways to test the modified dispersion relations (MDRs) of photons in vacuum, obtained in some attempts to formulate a theory of quantum gravity. The MDRs in use imply time delays that depend on the energy and that increase with distance following some function of redshift. The use of transi...
Matthews, James H. Reynolds, Christopher S. Marsh, M. C. David Sisk-Reynés, Júlia Rodman, Payton E.
Published in
The Astrophysical Journal
Axion-like particles (ALPs) are a well-motivated extension to the standard model of particle physics, and X-ray observations of cluster-hosted AGN currently place the most stringent constraints on the ALP coupling to electromagnetism, g a γ , for very light ALPs (m a ≲ 10−11 eV). We revisit limits obtained by Reynolds et al. using Chandra X-ray gra...
Fajardo-Acosta, Sergio B. Faisst, Andreas Grillmair, Carl J. Chary, Ranga-Ram Paladini, Roberta Rusholme, Ben Stickley, Nathaniel
Published in
The Astrophysical Journal
We analyze stellar proper motions in the COSMOS field to assess the presence of bulk motions. At bright magnitudes (G-band 18.5–20.76 AB), we use the proper motions of 1010 stars in the Gaia DR2 catalog. At the faint end, we compute proper motions of 11,519 pointlike objects at i-band magnitudes 19–25 AB using Hubble ACS and Subaru HSC data, which ...
Michalek, Grzegorz Gopalswamy, Nat Yashiro, Seiji
Published in
The Astrophysical Journal
We investigate the temporal evolution of the yearly total mass-loss rate (YTMLR) from the Sun through coronal mass ejections (CMEs) over solar cycles 23 and 24. The mass determination of CMEs can be subject to significant uncertainty. To minimize this problem, we have used extensive statistical analysis. For this purpose, we employed data included ...
Jencson, Jacob E. Sand, David J. Andrews, Jennifer E. Smith, Nathan Pearson, Jeniveve Strader, Jay Valenti, Stefano Beasor, Emma R. Rothberg, Barry
Published in
The Astrophysical Journal
We present the discovery of an exceptional dimming event in a cool supergiant star in the Local Volume spiral M51. The star, dubbed M51-DS1, was found as part of a Hubble Space Telescope (HST) search for failed supernovae (SNe). The supergiant, which is plausibly associated with a very young (≲6 Myr) stellar population, showed clear variability (am...
Shao, Yong Li, Xiang-Dong
Published in
The Astrophysical Journal
Recent gravitational-wave observations showed that binary black hole (BBH) mergers with massive components are more likely to have high effective spins. In the model of isolated binary evolution, BH spins mainly originate from the angular momenta of the collapsing cores before BH formation. Both observations and theories indicate that BHs tend to p...
童, 辉 王, 宸璨 王, 锶博
Published in
The Astrophysical Journal
The momentum and isospin dependence of the single-particle potential for the in-medium nucleon are the key quantities in the Relativistic Brueckner–Hartree–Fock (RBHF) theory. It depends on how to extract the scalar and the vector components of the single-particle potential inside nuclear matter. In contrast to the RBHF calculations in the Dirac sp...
Matsuoka, Tomoki Lee, Shiu-Hang Maeda, Keiichi Takiwaki, Tomoya Moriya, Takashi J.
Published in
The Astrophysical Journal
An ultra-stripped supernova (USSN) is a type of core-collapse supernova explosion proposed to be a candidate formation site of a double neutron star (DNS) binary. We investigate the dynamical evolution of an ultra-stripped supernova remnant (USSNR), which should host a DNS at its center. By accounting for the mass-loss history of the progenitor bin...
