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Detecting Biosignatures in the Atmospheres of Gas Dwarf Planets with the James Webb Space Telescope
Kendrew, Sarah; Hu, Renyu; Valenti, Jeff +5 more
Exoplanets with radii between those of Earth and Neptune have stronger surface gravity than Earth, and can retain a sizable hydrogen-dominated atmosphere. In contrast to gas giant planets, we call these planets gas dwarf planets. The James Webb Space Telescope (JWST) will offer unprecedented insight into these planets. Here, we investigate the det…
Stellar Spins in the Pleiades, Praesepe, and M35 Open Clusters
Schlaufman, Kevin C.; Healy, Brian F.; McCullough, P. R.
We analyze spectroscopic and photometric data to determine the projected inclinations of stars in three open clusters: the Pleiades, Praesepe, and M35. We determine the $\sin i$ values of 42, 35, and 67 stars in each cluster, respectively, and from their distributions we find that isotropic spins and moderate alignment are both consistent with the…
Balmer continuum enhancement detected in a mini flare observed with IRIS
Heinzel, Petr; Schmieder, Brigitte; Joshi, Reetika +3 more
Context. Optical and near-UV continuum emissions in flares contribute substantially to the flare energy budget. Two mechanisms play an important role for continuum emission in flares: hydrogen recombination after sudden ionization at chromospheric layers, and transportation of the energy radiatively from the chromosphere to lower layers in the atm…
The Consistency of Chemical Clocks among Coeval Stars
Jofré, Paula; Chanamé, Julio; Casamiquela, Laia +1 more
The abundance ratios of some chemical species have been found to correlate with stellar age, leading to the possibility of using stellar atmospheric abundances as stellar age indicators. These chemical clocks have already been calibrated with solar twins and open clusters, but it remains to be seen whether they can be effective at identifying coev…
Source-dependent Properties of Two Slow Solar Wind States
Moncuquet, Michel; Issautier, Karine; Poirier, Nicolas +3 more
Two states of the slow solar wind are identified from in situ measurements by the Parker Solar Probe (PSP) inside 50 solar radii from the Sun. At such distances the wind measured by PSP has not yet undergone significant transformation related to the expansion and propagation of the wind. We focus in this study on the properties of the quiet solar …
Keck/OSIRIS Paβ High-contrast Imaging and Updated Constraints on PDS 70b
Dong, Ruobing; Uyama, Taichi; Beichman, Charles A. +11 more
We present a high-contrast imaging search for Paβ line emission from protoplanets in the PDS 70 system with Keck/OSIRIS integral field spectroscopy. We applied the high-resolution spectral differential imaging technique to the OSIRIS J-band data but did not detect the Paβ line at the level predicted using the parameters of Hashimoto et al. (2020).…
The AMBRE Project: Solar neighbourhood chemodynamical constraints on Galactic disc evolution
Recio-Blanco, A.; de Laverny, P.; Kordopatis, G. +2 more
Context. The abundance of α-elements relative to iron ([α/Fe]) is an important fossil signature in Galactic archaeology for tracing the chemical evolution of disc stellar populations. High-precision chemical abundances, together with accurate stellar ages, distances, and dynamical data, are crucial to infer the Milky Way formation history.
Ai…
Accretion torque reversals in GRO J1008-57 revealed by Insight-HXMT
Wang, W.; Huang, Y.; Wang, C. +92 more
GRO J1008-57, as a Be/X-ray transient pulsar, is considered to have the highest magnetic field in known neutron star X-ray binary systems. Observational data of the X-ray outbursts in GRO J1008-57 from 2017 to 2020 were collected by the Insight-HXMT satellite. In this work, the spin period of the neutron star in GRO J1008-57 was determined to be a…
Molecular gas kinematics in the nuclear region of nearby Seyfert galaxies with ALMA
Andreani, P.; Hatziminaoglou, E.; Spinoglio, L. +11 more
Context. The study of the distribution, morphology, and kinematics of cold molecular gas in the nuclear and circumnuclear regions of active galactic nuclei (AGNs) helps to characterise and hence to quantify the impact of the AGNs on the host galaxy over its lifetime.
Aims: We present the analysis of the molecular gas in the nuclear regions of…
Vertical Structure and Color of Jovian Latitudinal Cloud Bands during the Juno Era
Baines, Kevin H.; Irwin, Patrick G. J.; Dahl, Emma K. +6 more
The identity of the coloring agent(s) in Jupiter's atmosphere and the exact structure of Jupiter's uppermost cloud deck are yet to be conclusively understood. The Crème Brûlée model of Jupiter's tropospheric clouds, originally proposed by Baines et al. and expanded upon by Sromovsky et al. and Baines et al., presumes that the chromophore measured …