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Sporadic Dips from Extended Debris Transiting the Metal-rich White Dwarf SBSS 1232+563
Hermes, J. J.; Hawkins, Keith; Badenas-Agusti, Mariona +5 more
We present the discovery of deep but sporadic transits in the flux of SBSS 1232+563, a metal-rich white dwarf polluted by disrupted exoplanetary debris. Nearly 25 yr of photometry from multiple sky surveys reveal evidence of occasional dimming of the white dwarf, most notably evident in an 8 month long event in 2023 that caused a >40% drop in f…
The Solar System's passage through the Radcliffe wave during the middle Miocene
Miret-Roig, N.; Burkert, A.; Alves, J. +14 more
Context. As the Solar System orbits the Milky Way, it encounters various Galactic environments, including dense regions of the interstellar medium (ISM). These encounters can compress the heliosphere, exposing parts of the Solar System to the ISM, while also increasing the influx of interstellar dust into the Solar System and Earth's atmosphere. T…
Spectroscopic detection of a 2.9-hour orbit in a long-period radio transient
Rodriguez, Antonio C.
Long-period radio transients (LPTs) are a mysterious new class of radio transients pulsating on periods of minutes to hours. To date, nine LPTs have been discovered predominantly at low Galactic latitudes, and yet their nature remains unknown. Here I present the first phase-resolved optical spectroscopy of the 2.9 h LPT GLEAM-X J0704–37, acquired …
REsolved ALMA and SMA Observations of Nearby Stars (REASONS): A population of 74 resolved planetesimal belts at millimetre wavelengths
Krivov, A. V.; Marshall, J. P.; del Burgo, C. +19 more
Context. Planetesimal belts are ubiquitous around nearby stars, and their spatial properties hold crucial information for planetesimal and planet formation models. Aims. We present resolved dust observations of 74 planetary systems as part of the REsolved ALMA and SMA Observations of Nearby Stars (REASONS) survey and archival reanalysis. Methods. …
Dynamical and Atmospheric Characterization of the Substellar Companion HD 33632 Ab from Direct Imaging, Astrometry, and Radial-velocity Data
Currie, Thayne; Tamura, Motohide; Kuzuhara, Masayuki +17 more
We present follow-up SCExAO/CHARIS H- and K-band (R ∼ 70) high-contrast integral field spectroscopy and Keck/NIRC2 photometry of directly imaged brown dwarf companion HD 33632 Ab and new radial-velocity data for the system from the SOPHIE spectrograph, complemented by Hipparcos and Gaia astrometry. These data enable more robust spectral characteri…
Determining the acceleration regions of in situ electrons using remote radio and X-ray observations
Jebaraj, I. C.; Vainio, R.; Kilpua, E. K. J. +13 more
Context. Solar energetic particles in the heliosphere are produced by flaring processes on the Sun or by shocks driven by coronal mass ejections. These particles are regularly detected remotely as electromagnetic radiation (X-rays or radio emission), which they generate through various processes, or in situ by spacecraft monitoring the Sun and the…
A multi-wavelength view of the isolated neutron star eRASSU J065715.3+260428
Haberl, F.; Pires, A. M.; Ji, L. +6 more
On the premise of a soft spectral distribution and absence of counterparts, the X-ray source eRASSU J065715.3+260428 was recently identified as a likely thermally emitting isolated neutron star (XINS) in a search in the SRG/eROSITA All-Sky Survey. We investigated the nature and evolutionary state of the neutron star through a dedicated multi-wavel…
New stellar bow shocks and bubbles found around runaway stars
Paredes, J. M.; Ribó, M.; Benaglia, P. +1 more
Context. Runaway stars with peculiar high velocities can generate stellar bow shocks. Only a few bow shocks show clear radio emission. Aims. Our goal is to identify and characterize new stellar bow shocks around O and Be runaway stars in the infrared (IR), as well as to study their possible radio emission and nature. Methods. Our input data is a c…
Origins of Super Jupiters: TOI-2145b has a Moderately Eccentric and Nearly Aligned Orbit
Mahadevan, Suvrath; Zhou, George; Chontos, Ashley +15 more
Super Jupiters are giant planets with several Jupiter masses. It remains an open question whether these planets originate with such high masses or grow through collisions. Previous work demonstrates that warm super Jupiters tend to have more eccentric orbits compared to regular-mass warm Jupiters. This correlation between mass and eccentricity may…
The 10 pc Neighborhood of Habitable Zone Exoplanetary Systems: Threat Assessment from Stellar Encounters and Supernovae
Swastik, C.; Banyal, Ravinder K.; Pyne, Tisyagupta +1 more
The habitability of a planet is influenced by both its parent star and the properties of its local stellar neighborhood. Potential threats to habitability from the local stellar environment mainly arise from two factors: cataclysmic events such as powerful stellar explosions and orbital perturbations induced by close stellar encounters. Among the …