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FUMES. II. Lyα Reconstructions of Young, Active M Dwarfs

France, Kevin; Youngblood, Allison; Pineda, J. Sebastian

The H I Lyα (1215.67 Å) emission line dominates the far-UV spectra of M dwarf stars, but strong absorption from neutral hydrogen in the interstellar medium makes observing Lyα challenging even for the closest stars. As part of the Far-Ultraviolet M-dwarf Evolution Survey, the Hubble Space Telescope has observed 10 early-to-mid M dwarfs with ages r…

Ross 19B: An Extremely Cold Companion Discovered via the Backyard Worlds: Planet 9 Citizen Science Project

Debes, John H.; Gonzales, Eileen C.; Kiman, Rocio +25 more

Through the Backyard Worlds: Planet 9 citizen science project, we have identified a wide-separation (~10', ~9900 au projected) substellar companion to the nearby (~17.5 pc), mid-M dwarf Ross 19. We have developed a new formalism for determining chance alignment probabilities based on the BANYAN Σ tool, and find a 100% probability that this is a ph…

The intermediate polar cataclysmic variable GK Persei 120 years after the nova explosion: a first dynamical mass study

Sabo, R.; Torres, M. A. P.; Hakala, P. +15 more

We present a dynamical study of the intermediate polar and dwarf nova cataclysmic variable GK Persei (Nova Persei 1901) based on a multisite optical spectroscopy and R-band photometry campaign. The radial velocity curve of the evolved donor star has a semi-amplitude $K_2=126.4 \pm 0.9 \, \mathrm{km}\, \mathrm{s}^{-1}$ and an orbital period $P=1.99…

The MUSE Hubble Ultra Deep Field Survey. XVI. The angular momentum of low-mass star-forming galaxies: A cautionary tale and insights from TNG50

Bacon, Roland; Contini, Thierry; Richard, Johan +14 more

We investigate the specific angular momentum (sAM) j(< r) profiles of intermediate redshift (0.4 < z < 1.4) star-forming galaxies (SFGs) in the relatively unexplored regime of low masses (down to M_⋆ ∼ 10⁸ M_⊙) and small sizes (down to R_e ∼ 1.5 kpc), and we characterize the sAM scaling relation (i…

The Sun's distance from the Galactic Centre and mid-plane, and the Galactic old bulge's morphology: 715 VVV Type II Cepheids

Pietrukowicz, Pawel; Gedalin, Michael; Jiang, Ing-Guey +2 more

A statistical method is employed in tandem with new VISTA Variables in the Via Lactea (VVV) near-infrared observations to determine the Sun's distance from the Galactic Centre (r₀, GC), the Sun's height from the local mid-plane (z₀), and to likewise infer the shape of the Galactic ∼10 Gyr old bulge. Specifically, the conclusi…

First Observations of Anomalous Cosmic Rays in to 36 Solar Radii

McComas, D. J.; Christian, E. R.; Leske, R. A. +11 more

NASA's Parker Solar Probe mission continues to travel closer to the Sun than any prior human-made object, with an expected closest approach of <10 solar radii (<0.046 au) by 2024. On board, the Integrated Science Investigation of the Sun instrument suite makes unprecedented in situ measurements of energetic particles in the near-Sun environm…

The TESS-Keck Survey. VI. Two Eccentric Sub-Neptunes Orbiting HIP-97166

Batalha, Natalie M.; Latham, David W.; Rice, Malena +45 more

We report the discovery of HIP-97166b (TOI-1255b), a transiting sub-Neptune on a 10.3 day orbit around a K0 dwarf 68 pc from Earth. This planet was identified in a systematic search of TESS Objects of Interest for planets with eccentric orbits, based on a mismatch between the observed transit duration and the expected duration for a circular orbit…

A multiwavelength analysis of the spiral arms in the protoplanetary disk around WaOph 6

Ménard, F.; Ginski, C.; Garufi, A. +23 more

Context. In recent years, protoplanetary disks with spiral structures have been detected in scattered light, millimeter continuum, and CO gas emission. The mechanisms causing these structures are still under debate. A popular scenario to drive the spiral arms is the one of a planet perturbing the material in the disk. However, if the disk is massi…

A microlensing search of 700 million VVV light curves

McGill, Peter; Smith, Leigh C.; Evans, N. Wyn +1 more

The VISTA Variables in the Via Lactea (VVV) survey and its extension have been monitoring about 560 deg² of sky centred on the Galactic bulge and inner disc for nearly a decade. The photometric catalogue contains of order 10$^9$ sources monitored in the $K_s$ band down to 18 mag over hundreds of epochs from 2010 to 2019. Using these dat…

Single Image Super-Resolution Restoration of TGO CaSSIS Colour Images: Demonstration with Perseverance Rover Landing Site and Mars Science Targets

Tao, Yu; Muller, Jan-Peter; Conway, Susan J. +3 more