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A Diverse, Overlooked Population of Type Ia Supernovae Exhibiting Mid-infrared Signatures of Delayed Circumstellar Interaction
Burdge, Kevin B.; Sollerman, Jesper; De, Kishalay +10 more
Type Ia supernovae (SNe Ia) arise from the thermonuclear explosions of white dwarfs in multiple-star systems. A rare subclass of SNe Ia exhibit signatures of interaction with circumstellar material (CSM), allowing for direct constraints on companion material. While most known events show evidence for dense nearby CSM identified via peak-light spec…
Precise Measurements of the LMC Bar's Geometry with Gaia DR3 and a Novel Solution to Crowding-induced Incompleteness in Star Counting
Choi, Yumi; Besla, Gurtina; Olsen, Knut A. G. +1 more
We present new measurements of the 2D geometry of the LMC's stellar bar with precise astrometric observations of red clump stars in Gaia DR3. We develop a novel solution to tackle crowding-induced incompleteness in Gaia data sets with the Gaia BP-RP color excess. Utilizing the color excess information, we derive a 2D completeness map of the LMC's …
Measurements of the thermal and ionization state of the intergalactic medium during the cosmic afternoon
Hennawi, Joseph F.; Tripp, Todd M.; Khaire, Vikram +4 more
We perform the first measurement of the thermal and ionization state of the intergalactic medium (IGM) across
A halo model approach for mock catalogs of time-variable strong gravitational lenses
Marshall, Philip J.; Oguri, Masamune; Birrer, Simon +5 more
Time delays in both galaxy- and cluster-scale strong gravitational lenses have recently attracted a lot of attention in the context of the Hubble tension. Future wide-field cadenced surveys, such as the LSST, are anticipated to discover strong lenses across various scales. We generate mock catalogs of strongly lensed QSOs and SNe on galaxy-, group…
High-resolution observational analysis of flare ribbon fine structures
Fletcher, Lyndsay; Nóbrega-Siverio, Daniel; Aulanier, Guillaume +4 more
Context. Since the mechanism of energy release from solar flares is still not fully understood, the study of fine-scale features developing during flares becomes important for progressing towards a consistent picture of the essential physical mechanisms. Aims. Solar flares release most of their luminous energy in the chromosphere. These luminous s…
ALMA Spectral Survey of an Eruptive Young Star, V883 Ori (ASSAY). II. Freshly Sublimated Complex Organic Molecules in the Keplerian Disk
Herczeg, Gregory J.; Johnstone, Doug; Lee, Jeong-Eun +9 more
We present an investigation of complex organic molecules (COMs) in the spatially resolved Keplerian disk around V883 Ori, an eruptive young star, based on a spectral survey carried out with the Atacama Large Millimeter/submillimeter Array in Band 6 (220.7‑274.9 GHz). We identified about 3700 molecular emission lines and discovered 23 COMs in the d…
A Multiwavelength Light-curve Analysis of the Classical Nova KT Eri: Optical Contribution from a Large Irradiated Accretion Disk
Walter, Frederick M.; Kato, Mariko; Hachisu, Izumi
KT Eri is a classical nova that went into outburst in 2009. Recent photometric analysis in quiescence indicates a relatively longer orbital period of 2.6 days, so that KT Eri could host a very bright accretion disk during the outburst like in the recurrent nova U Sco, the orbital period of which is 1.23 days. We reproduced the optical V light curv…
Observation of super-Alfvénic slippage of reconnecting magnetic field lines on the Sun
Polito, Vanessa; De Pontieu, Bart; Aulanier, Guillaume +3 more
Slipping motions of magnetic field lines are a distinct signature of three-dimensional magnetic reconnection, a fundamental process driving solar and stellar flares. While being a key prediction of numerical experiments, the rapid super-Alfvénic field line slippage driven by the `slip-running' reconnection has remained elusive in previous observat…
Stellar Metallicities from DECam u-band Photometry: A Study of Milky Way Ultra-faint Dwarf Galaxies
Li, Ting S.; Chiti, Anirudh; Limberg, Guilherme +5 more
We conducted an in-depth analysis of candidate member stars located in the peripheries of three ultra-faint dwarf (UFD) galaxy satellites of the Milky Way (MW): Boötes I (Boo1), Boötes II (Boo2), and Segue I (Seg1). Studying these peripheral stars has previously been difficult due to contamination from the MW foreground. We used u-band photometry …
Gaia-4b and 5b: Radial Velocity Confirmation of Gaia Astrometric Orbital Solutions Reveal a Massive Planet and a Brown Dwarf Orbiting Low-mass Stars
Callingham, J. R.; Cochran, William D.; Mahadevan, Suvrath +31 more
Gaia astrometry of nearby stars is precise enough to detect the tiny displacements induced by substellar companions, but radial velocity (RV) data are needed for definitive confirmation. Here we present RV follow-up observations of 28 M and K stars with candidate astrometric substellar companions, which led to the confirmation of two systems, Gaia…