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A multiband look at ultraluminous X-ray sources in NGC 7424
Soria, Roberto; Russell, Thomas D.; Motch, Christian +2 more
We studied the multiband properties of two ultraluminous X-ray sources (2CXO J225728.9-410211 = X-1 and 2CXO J225724.7-410343 = X-2) and their surroundings, in the spiral galaxy NGC 7424. Both sources have approached X-ray luminosities LX ~ 1040 erg s-1 at some epochs. Thanks to a more accurate astrometric solution…
A Database for Simultaneous Observations of the Earth's Magnetosheath by Cluster and MMS Between 2017 and 2021
Voitcu, Gabriel; Echim, Marius; Munteanu, Costel +4 more
This paper describes a catalog of simultaneous observations of the Earth's magnetosheath by ESA's Cluster and NASA's MMS missions. The catalog is built from a visual inspection of summary plots provided by the two missions complemented by an analysis of high-resolution magnetic field data. The catalog includes 117 events when Cluster 4 and MMS 4 c…
Synthesis of Organic and Inorganic Compounds in Asymptotic Giant Branch Stars
Kwok, Sun
After the synthesis of carbon in the core of asymptotic giant branch (AGB) stars, carbon is dredged up to the surface by convection. Many carbon-based molecules are formed in the subsequently developed stellar wind. These include acetylene, which can link together to form benzene in post-AGB evolution. The emergence of the spectral signatures of a…
Constraining planetary albedo of JWST targets in the TESS bandpass, using TESS, HST, and Spitzer eclipse depth observations
Goyal, Jayesh; Arora, Rahul
Albedo is one of the important characteristics of hot Jupiter exoplanets. However, albedo constraints have been obtained for very few exoplanets. In this work, we present the Transiting Exoplanet Survey Satellite (TESS) phase curve observations of WASP-18b, WASP-19b, WASP-121b, WASP-43b, WASP-17b, and WASP-77b, all targets for atmospheric characte…
DanceCam: atmospheric turbulence mitigation in wide-field astronomical images with short-exposure video streams
Cuillandre, Jean-Charles; Bialek, Spencer; Bertin, Emmanuel +4 more
We introduce a novel technique to mitigate the adverse effects of atmospheric turbulence on astronomical imaging. Utilizing a video-to-image neural network trained on simulated data, our method processes a sliding sequence of short-exposure (~0.2 s) stellar field images to reconstruct an image devoid of both turbulence and noise. We demonstrate th…
Validation of up to seven TESS planet candidates through multi-colour transit photometry using MuSCAT2 data
Tamura, M.; Pallé, E.; Béjar, V. J. S. +62 more
The TESS mission searches for transiting exoplanets by monitoring the brightness of hundreds of thousands of stars across the entire sky. M-type planet hosts are ideal targets for this mission due to their smaller size and cooler temperatures, which makes it easier to detect smaller planets near or within their habitable zones. Additionally, M dwa…
Atomic Transition Probabilities for Ultraviolet and Optical Lines of Tm II
Roederer, I. U.; Den Hartog, E. A.; Voith, G. T.
We report new branching fraction measurements for 224 ultraviolet and optical transitions of Tm II. These transitions range in wavelength (wavenumber) from 2350 to 6417 Å (42,532–15,579 cm‑1) and originate in 13 odd-parity and 24 even-parity upper levels. Thirty-five of the 37 levels, accounting for 213 of the 224 transitions, are studi…
Molecular Hydrogen Line Identifications in Solar Flares Observed by IRIS: Lower Atmospheric Structure from Radiometric Analysis
Jaeggli, Sarah A.; Daw, Adrian N.
A rich spectrum of molecular hydrogen (H2) emission lines is seen in sensitive observations from the far-ultraviolet (FUV) channels of the Interface Region Imaging Spectrograph (IRIS) during flare activity in solar active region NOAA Active Region 11861. Based on this observation, we have determined 37 new line identifications by compar…
SuperBIT Superpressure Flight Instrument Overview and Performance: Near-diffraction-limited Astronomical Imaging from the Stratosphere
Massey, Richard; Jauzac, Mathilde; Harvey, David +26 more
SuperBIT was a 0.5 m near-UV to near-infrared wide-field telescope that launched on a NASA superpressure balloon into the stratosphere from New Zealand for a 45-night flight. SuperBIT acquired multiband images of galaxy clusters to study the properties of dark matter using weak gravitational lensing. We provide an overview of the instrument and it…
Spectro-photometric follow-up of the outbursting AM CVn system ASASSN-21br
Mukai, K.; Maccarone, T. J.; Kochanek, C. S. +8 more
We report on spectroscopic and photometric observations of the AM Canum Venaticorum (AM CVn) system ASASSN-21br, which was discovered in outburst by the All-Sky Automated Survey for Supernovae in 2021 February. The outburst lasted for around three weeks, and exhibited a pronounced brightness dip for $\approx$4 d, during which the spectra showed a …