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The evolving paradigm of the subauroral geospace
Mishin, Evgeny V.
An assessment of the status quo of fast subauroral flows—subauroral ion drifts (SAID) and subauroral polarization streams (SAPS), is presented. For a few decades, their development has been interpreted in terms of the voltage and current magnetospheric generators based largely on the drift motion of test particles. Recent multispacecraft observati…
A T-dwarf candidate from JWST early release NIRCam data
Hashimoto, Tetsuya; Goto, Tomotsugu; Kim, Seong Jin +6 more
We present a distant T-type brown dwarf candidate at ≈2.55 kpc discovered in the Cosmic Evolution Early Release Science (CEERS) fields by JWST NIRCam. In addition to the superb sensitivity, we utilized seven filters from JWST in near-infrared and thus is advantageous in finding faint, previously unseen brown dwarfs. From the model spectra in new J…
Progress on nuclear reaction rates affecting the stellar production of 26Al
Meynet, G.; Diehl, R.; Vink, J. S. +24 more
The radioisotope 26Al is a key observable for nucleosynthesis in the Galaxy and the environment of the early Solar System. To properly interpret the large variety of astronomical and meteoritic data, it is crucial to understand both the nuclear reactions involved in the production of 26Al in the relevant stellar sites and the…
Star Formation and AGN Activity 500 Myr after the Big Bang: Insights from JWST
D'Silva, Jordan C. J.; Driver, Simon P.; Lagos, Claudia D. P. +3 more
We consider the effect of including an active galactic nuclei (AGN) component when fitting spectral energy distributions of 109 spectroscopically confirmed z ≈ 3.5-12.5 galaxies with JWST. Remarkably, we find that the resulting cosmic star formation history is ≈0.4 dex lower at z ≳ 9.5 when an AGN component is included in the fitting. This allevia…
Matter ejections behind the highs and lows of the transitional millisecond pulsar PSR J1023+0038
Covino, S.; D'Avanzo, P.; Campana, S. +23 more
Transitional millisecond pulsars are an emerging class of sources that link low-mass X-ray binaries to millisecond radio pulsars in binary systems. These pulsars alternate between a radio pulsar state and an active low-luminosity X-ray disc state. During the active state, these sources exhibit two distinct emission modes (high and low) that altern…
The AstroSat UV Deep Field North: The Far- and Near-ultraviolet Photometric Catalog
Teplitz, Harry I.; Rafelski, Marc; Saha, Kanak +7 more
We present deep UV imaging observations of the Great Observatories Origins Survey Northern (GOODS-N) field with AstroSat/UVIT (AstroSat UV Deep Field north-AUDFn), using one far-UV (FUV) (F154W, 34.0 ks) and two near-UV (NUV) filters (N242W, 19.2 ks; N245M, 15.5 ks). The nature of the UV sky background was explored across the UVIT field, and a glo…
A compact multi-planet system transiting HIP 29442 (TOI-469) discovered by TESS and ESPRESSO. Radial velocities lead to the detection of transits with low signal-to-noise ratio
Bouchy, F.; Rebolo, R.; Zapatero Osorio, M. R. +52 more
Context. One of the goals of the Echelle Spectrograph for Rocky Exoplanets and Stable Spectroscopic Observations (ESPRESSO) Guaranteed Time Observations (GTO) consortium is the precise characterisation of a selected sample of planetary systems discovered by TESS. One such target is the K0V star HIP 29442 (TOI-469), already known to host a validate…
Extending the Dynamic Range of Galaxy Outflow Scaling Relations: Massive Compact Galaxies with Extreme Outflows
Moustakas, John; Coil, Alison L.; Rudnick, Gregory H. +11 more
We investigate galactic winds in the HizEA galaxies, a collection of 46 late-stage galaxy mergers at z = 0.4-0.8, with stellar masses of $\mathrm{log}({M}_{* }/{M}_{\odot })=10.4\mbox{--}11.5$ , star formation rates (SFRs) of 20-500 M ⊙ yr-1, and ultra-compact (a few 100 pc) central star-forming regions. We measure their gas …
A Mini-Neptune Orbiting the Metal-poor K Dwarf BD+29 2654
Hellier, Coel; Batalha, Natalie M.; Kane, Stephen R. +48 more
We report the discovery and Doppler mass measurement of a 7.4 days 2.3 R ⊕ mini-Neptune around a metal-poor K dwarf BD+29 2654 (TOI-2018). Based on a high-resolution Keck/HIRES spectrum, the Gaia parallax, and multiwavelength photometry from the UV to the mid-infrared, we found that the host star has ${T}_{\mathrm{eff}}={4174}_{-42}^{+3…
Improved radius determinations for the transiting brown dwarf population in the era of Gaia and TESS
Carmichael, Theron W.
I report updates to the substellar mass-radius diagram for 11 transiting brown dwarfs (BDs) and low-mass stars published before the third data release from the Gaia mission (Gaia DR3). I re-analyse these transiting BD systems whose physical parameters were published between 2008 and 2019 and find that when using the parallax measurements from Gaia…