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Serendipitous Nebular-phase JWST Imaging of SN Ia SN 2021aefx: Testing the Confinement of 56Co Decay Energy
Galbany, L.; Morrell, Nidia; Leroy, Adam K. +29 more
We present new 0.3-21 µm photometry of SN 2021aefx in the spiral galaxy NGC 1566 at +357 days after B-band maximum, including the first detection of any Type Ia supernova (SN Ia) at >15 µm. These observations follow earlier JWST observations of SN 2021aefx at +255 days after the time of maximum brightness, allowing us to probe the t…
Deprojecting and constraining the vertical thickness of exoKuiper belts
Wyatt, Mark C.; Jennings, Jeff; Booth, Richard A. +3 more
Constraining the vertical and radial structure of debris discs is crucial to understanding their formation, evolution, and dynamics. To measure both the radial and vertical structure, a disc must be sufficiently inclined. However, if a disc is too close to edge-on, deprojecting its emission becomes non-trivial. In this paper we show how FRANKENSTE…
The β Pictoris system: Setting constraints on the planet and the disk structures at mid-IR wavelengths with NEAR
Boccaletti, Anthony; Pantin, Eric; Baruteau, Clément +26 more
Context. β Pictoris is a young nearby system hosting a well-resolved edge-on debris disk, along with at least two exoplanets. It offers key opportunities for carrying out detailed studies of the evolution of young planetary systems and their shaping soon after the end of the planetary formation phase.
Aims: We analyzed high-contrast coronagra…
Octofitter: Fast, Flexible, and Accurate Orbit Modeling to Detect Exoplanets
Crotts, Katie A.; Rice, Malena; Do Ó, Clarissa R. +11 more
As next-generation imaging instruments and interferometers search for planets closer to their stars, they must contend with increasing orbital motion and longer integration times. These compounding effects make it difficult to detect faint planets but also present an opportunity. Increased orbital motion makes it possible to move the search for pl…
The path from the Chinese and Japanese observations of supernova 1181 AD, to a Type Iax supernova, to the merger of CO and ONe white dwarfs
Schaefer, Bradley E.
In 1181 AD, Chinese and Japanese observers reported an unmoving bright 'Guest Star' in the constellation Chuanshe, visible for 185 d. In 2013, D. Patchick discovered what turned out to be a unique nebula surrounding a unique star, with the structure named 'Pa 30', while subsequent workers made connections to mergers of white dwarfs, to the superno…
Stellar Characterization and Radius Inflation of Hyades M-dwarf Stars from the APOGEE Survey
Pascucci, Ilaria; Bizyaev, Dmitry; Pan, Kaike +23 more
We present a spectroscopic analysis of a sample of 48 M-dwarf stars (0.2 M ⊙ < M < 0.6 M ⊙) from the Hyades open cluster using high-resolution H-band spectra from the Sloan Digital Sky Survey/Apache Point Observatory Galactic Evolution Experiment (APOGEE) survey. Our methodology adopts spectrum synthesis with LTE MARCS …
Atomic Transition Probabilities for Transitions of Si I and Si II and the Silicon Abundances of Several Very Metal-poor Stars
Sneden, C.; Roederer, I. U.; Lawler, J. E. +2 more
We report new measurements of branching fractions for 20 UV and blue lines in the spectrum of neutral silicon (Si I) originating in the 3s 23p4s 3Po 1,2,1Po 1, and 3s3p 3 1Do 1,2 upper levels. Transitions studied include both st…
Irregular Proton Injection to High Energies at Interplanetary Shocks
Wimmer-Schweingruber, Robert F.; Dresing, Nina; Vainio, Rami +8 more
How thermal particles are accelerated to suprathermal energies is an unsolved issue, crucial for many astrophysical systems. We report novel observations of irregular, dispersive enhancements of the suprathermal particle population upstream of a high-Mach-number interplanetary shock. We interpret the observed behavior as irregular "injections" of …
Asteroseismological analysis of the polluted ZZ Ceti star G 29 - 38 with TESS
Kepler, S. O.; Córsico, Alejandro H.; Bell, Keaton J. +15 more
G 29 - 38 (TIC 422526868) is one of the brightest (V = 13.1) and closest (d = 17.51 pc) pulsating white dwarfs with a hydrogen-rich atmosphere (DAV/ZZ Ceti class). It was observed by the TESS spacecraft in sectors 42 and 56. The atmosphere of G 29 - 38 is polluted by heavy elements that are expected to sink out of visible layers on short time-scal…
A spectacular jet from the bright 244-440 Orion proplyd: The MUSE NFM view
Robberto, M.; Facchini, S.; Manara, C. F. +8 more
In this work we present the highest spatial and spectral resolution integral field observations to date of the bipolar jet from the Orion proplyd 244-440 using Multi-Unit Spectroscopic Explorer (MUSE) narrow-field mode (NFM) observations on the Very Large Telescope (VLT). We observed a previously unreported chain of six distinct knots in a roughly…