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Cool and data-driven: an exploration of optical cool dwarf chemistry with both data-driven and physical models
Casey, Andrew R.; Monty, Stephanie; Nordlander, Thomas +6 more
Detailed chemical studies of F/G/K - or solar-type - stars have long been routine in stellar astrophysics, enabling studies in both Galactic chemodynamics and exoplanet demographics. However, similar understanding of the chemistry of M and late-K dwarfs - the most common stars in the Galaxy - has been greatly hampered both observationally and theo…
The spin, expansion, and contraction of open star clusters
Jadhav, Vikrant V.; Kroupa, Pavel; Thies, Ingo +2 more
Context. Empirical constraints on the internal dynamics of open clusters are important for understanding their evolution and evaporation. High-precision astrometry from Gaia DR3 is thus useful to observe aspects of the cluster dynamics.
Aims: This work aims to identify dynamically peculiar clusters such as spinning and expanding clusters. We …
Turbulent Vortex with Moderate Dust Settling Probed by Scattering-induced Polarization in the IRS 48 System
Li, Zhi-Yun; Yang, Haifeng; Looney, Leslie W. +4 more
We investigate the crescent-shaped dust trap in the transition disk Oph IRS 48 using well-resolved (sub)millimeter polarimetric observations at ALMA Band 7 (870 µm). The dust polarization map reveals patterns consistent with dust-scattering-induced polarization. There is a relative displacement between the polarized flux and the total flux, …
TIC 290061484: A Triply Eclipsing Triple System with the Shortest Known Outer Period of 24.5 Days
Mitnyan, T.; Pál, A.; Vanderburg, A. +13 more
We have discovered a triply eclipsing triple-star system, TIC 290061484, with the shortest known outer period, P out, of only 24.5 days. This "eclipses" the previous record set by λ Tauri at 33.02 days, which held for 68 yr. The inner binary, with an orbital period of P in = 1.8 days, produces primary and secondary eclipses a…
Ages of Stars and Planets in the Kepler Field Younger than Four Billion Years
Howard, Andrew W.; Bouma, Luke G.; Hillenbrand, Lynne A. +3 more
Recent analyses of FGK stars in open clusters have helped clarify the precision with which a star's rotation rate and lithium content can be used as empirical indicators for its age. Here we apply this knowledge to stars observed by Kepler. Rotation periods are drawn from previous work; lithium is measured from new and archival Keck/HIRES spectra.…
JWST/NIRISS and HST: Exploring the improved ability to characterize exoplanet atmospheres in the JWST era
Parmentier, Vivien; Taylor, Jake; Radica, Michael +6 more
The Hubble Space Telescope has been a pioneering instrument for studying the atmospheres of exoplanets, specifically its WFC3 and STIS instruments. With the launch of JWST, we are able to observe larger spectral ranges at higher precision. NIRISS/SOSS covers the range 0.6-2.8 microns, and thus, it can serve as a direct comparison to WFC3 (0.8-1.7 …
A population of Optically Quiescent Quasars from WISE and SDSS
Gandhi, Poshak; Stern, Daniel; Toba, Yoshiki +4 more
The growth of active galactic nuclei (AGNs) occurs under some form of obscuration in a large fraction of the population. The difficulty in constraining this population leads to high uncertainties in cosmic X-ray background and galaxy evolution models. Using an SDSS-WISE cross-match, we target infrared luminous AGN (W1 - W2 > 0.8, and monochroma…
Long-term Study of the 2020 Magnetar-like Outburst of the Young Pulsar PSR J1846-0258 in Kes 75
Campana, S.; Tiengo, A.; Götz, D. +14 more
Magnetar-like activity has been observed in a large variety of neutron stars. PSR J1846‑0258 is a young 327 ms radio-quiet pulsar with a large rotational power (∼8 × 1036 erg s‑1), and resides at the center of the supernova remnant Kes 75. It is one of the rare examples of a high-magnetic-field pulsar showing characteristics …
Improved model of the Supernova Refsdal cluster MACS J1149.5+2223 thanks to VLT/MUSE
Grillo, C.; Rosati, P.; Stiavelli, M. +9 more
We present new VLT/MUSE observations of the Hubble Frontier Field (HFF) galaxy cluster MACS J1149.5+2223, lensing the well-known supernova "Refsdal" into multiple images, which has enabled the first cosmological applications with a strongly lensed supernova. Thanks to these data, targeting a northern region of the cluster and thus complementing ou…
TOI-837 b is a young Saturn-sized exoplanet with a massive 70 M⊕ core
Aigrain, Suzanne; Gillen, Edward; Mortier, Annelies +10 more
We present an exhaustive photometric and spectroscopic analysis of TOI-837, a F9/G0 35 Myr young star, hosting a transiting exoplanet, TOI-837 b, with an orbital period of ~8.32 d. Utilizing data from the Transiting Exoplanet Survey Satellite and ground-based observations, we determine a planetary radius of $0.818_{-0.024}^{+0.034}$ RJ …