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The Origin of Dust Polarization in the Orion Bar
Soam, Archana; Hoang, Thiem; Le Gouellec, Valentin J. M. +8 more
The linear polarization of thermal dust emission provides a powerful tool to probe interstellar and circumstellar magnetic fields, because aspherical grains tend to align themselves with magnetic field lines. While the Radiative Alignment Torque (RAT) mechanism provides a theoretical framework for this phenomenon, some aspects of this alignment me…
Probability Distribution Functions of Sunspot Magnetic Flux
Toriumi, Shin; Sakurai, Takashi
We investigated the probability distributions of sunspot area and magnetic flux by using data from the Royal Greenwich Observatory and USAF/NOAA. We constructed a sample of 2995 regions with maximum-development areas ≥500 MSH (millionths of solar hemisphere), covering 146.7 yr (1874-2020). The data were fitted by a power-law distribution and four …
TESS discovery of a super-Earth orbiting the M-dwarf star TOI-1680
Queloz, D.; Narita, N.; Winn, J. N. +52 more
We report the discovery by the TESS mission of a super-Earth on a 4.8-days orbit around an inactive M4.5 dwarf (TOI-1680), validated by ground-based facilities. The host star is located 37.14 pc away, with a radius of 0.2100 ± 0.0064 R⊙, mass of 0.1800 ± 0.0044 M⊙, and an effective temperature of 3211 ±100 K. We validated and…
Radio Absorption in the Nightside Ionosphere of Mars During Solar Energetic Particle Events
Lester, M.; Leblanc, F.; Sánchez-Cano, B. +3 more
Characterization, understanding, and prediction of the Martian radio environment are of increasing importance to the forthcoming human exploration of Mars. Here we investigate 3-5 MHz radio absorption in the nightside ionosphere of Mars caused by enhanced ionization at <100 km altitudes during solar energetic particle (SEP) events. We conduct a…
HSC-CLAUDS survey: The star formation rate functions since z ∼ 2 and comparison with hydrodynamical simulations
Le Floc'h, E.; Ilbert, O.; Toft, S. +16 more
Context. Star formation rate functions (SFRFs) give an instantaneous view of the distribution of star formation rates (SFRs) in galaxies at different epochs. They are a complementary and more stringent test for models than the galaxy stellar mass function, which gives an integrated view of the past star formation activity. However, the exploration…
Broadband study and the discovery of pulsations from the Be/X-ray binary eRASSU J052914.9−662446 in the Large Magellanic Cloud
Haberl, F.; Santangelo, A.; Udalski, A. +12 more
Context. The Magellanic Clouds are our nearest star-forming galaxies. While the population of high-mass X-ray binaries (HMXBs) in the Small Magellanic Cloud is relatively well studied, our knowledge about the Large Magellanic Cloud (LMC) is far from complete given its large angular extent and the insufficient coverage with X-ray observations.
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Discovery of 20 UV-emitting SNRs in M31 with UVIT
Leahy, Denis; Monaghan, Christopher; Ranasinghe, Sujith
We present the first catalog of supernova remnants (SNRs) in M31 that exhibit diffuse ultraviolet (UV) emission. UV images of M31 were obtained by the Ultraviolet Imaging Telescope (UVIT) on the AstroSat satellite, and the list of SNRs was obtained from X-ray, optical, and radio catalogs of SNRs in M31. We used the UVIT images to find SNRs with di…
Jupiter-like planets might be common in a low-density environment
D'Orazi, Valentina; Zurlo, Alice; Gratton, Raffaele +6 more
Radial velocity surveys suggest that the Solar System may be unusual and that Jupiter-like planets have a frequency < 20% around solar-type stars. However, they may be much more common in one of the closest associations in the solar neighbourhood. Young moving stellar groups are the best targets for direct imaging of exoplanets and four massive…
Exploring the evolution of dust temperature using spectral energy distribution fitting in a large photometric survey
Stanway, Elizabeth R.; Jones, Gareth T.
Panchromatic analysis of galaxy spectral energy distributions, spanning from the ultraviolet to the far-infrared, probes not only the stellar population but also the properties of interstellar dust through its extinction and long-wavelength re-emission. However, little work has exploited the full power of such fitting to constrain the redshift evo…
TIC 43152097 The first eclipsing binary in NGC 2232
Vallenari, A.; Bragaglia, A.; D'Orazi, V. +5 more
We report the discovery of a low-mass totally eclipsing system in the young (age ≃ 28 Myr) open cluster NGC 2232, during an examination of their TESS photometry. The follow-up study of this detached system, TIC 43152097, is based on photometry and high-resolution spectra from the literature and collected by us. The radial velocity of the center of…