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The TESS–Keck Survey. XIX. A Warm Transiting Sub-Saturn-mass Planet and a Nontransiting Saturn-mass Planet Orbiting a Solar Analog
Batalha, Natalie M.; Bieryla, Allyson; Latham, David W. +45 more
The Transiting Exoplanet Survey Satellite (TESS) continues to increase dramatically the number of known transiting exoplanets, and is optimal for monitoring bright stars amenable to radial velocity (RV) and atmospheric follow-up observations. TOI-1386 is a solar-type (G5V) star that was detected via TESS photometry to exhibit transit signatures in…
New Anisotropic Cosmic-Ray Enhancement (ACRE) Event on 5 November 2023 Due to Complex Heliospheric Conditions
Larsen, Nicholas; Gil, Agnieszka; Usoskin, Ilya +2 more
The variability of galactic cosmic rays near Earth is nearly isotropic and driven by large-scale heliospheric modulation but rarely can very local anisotropic events be observed in low-energy cosmic rays. These anisotropic cosmic-ray enhancement (ACRE) events are related to interplanetary transients. Until now, two such events have been known. Her…
Herschel investigation of cores and filamentary structures in L1251 located in the Cepheus flare
Soam, Archana; Zhang, Guo-Yin; Dewan, Divyansh +3 more
Molecular clouds are the prime locations of star formation. These clouds contain filamentary structures and cores which are crucial in the formation of young stars. In this work, we aim to quantify the physical properties of structural characteristics within the molecular cloud L1251 to better understand the initial conditions for star formation. …
Magnetosheath Plasma Flow and Its Response to IMF and Geodipole Tilt as Obtained From the Data-Based Modeling
Semenov, V. S.; Erkaev, N. V.; Tsyganenko, N. A. +1 more
Large-scale patterns of the steady-state magnetosheath plasma flow and their dependence on the interplanetary magnetic field (IMF) have been reconstructed for the first time on the basis of large multi-year multi-mission pool of spacecraft observations, concurrent interplanetary data, and an empirical high-resolution model. The flow model architec…
SPECtrophotometer for TRansmission Spectroscopy of Exoplanets (SPECTR)
Lee, Byeong-Cheol; Park, Myeong-Gu; Choi, Yeon-Ho +9 more
The SPECtrophotometer for TRansmission spectroscopy of exoplanets (SPECTR) is a new low-resolution optical (3800–6850 Å) spectrophotometer installed at the Bohyunsan Optical Astronomy Observatory 1.8 m telescope. SPECTR is designed for observing the transmission spectra of transiting exoplanets. Unique features of SPECTR are its long slit length o…
Searching for stellar population in the molecular cloud GRSMC 045.49+00.04
Elia, Davide; Azatyan, Naira; Nikoghosyan, Elena +5 more
Understanding the characteristics of young stellar populations is essential for deriving insights into star formation processes within parent molecular clouds and the influence of massive stars on these processes. This study primarily aims to investigate the young stellar objects (YSOs) within the molecular cloud G 045.49+00.04, including three ul…
Discovering Subsolar Metallicity Brown Dwarf Candidates in the Small Magellanic Cloud
Pacifici, Camilla; Manjavacas, Elena; Sabbi, Elena +3 more
We present the discovery of the first rich population of brown dwarf candidates (cBD) at subsolar metallicity, observed by JWST outside the Milky Way (MW) in the young SMC star cluster NGC 602. Located in the Small Magellanic Cloud (SMC) "wing," in a very low-density environment (1.3 cm‑3) and at subsolar metallicity, NGC 602 is very yo…
First determination of the system parameters in five contact binaries
Dębski, B.; Kulczycka, L.; Skrobacz, W. +2 more
We present solutions of the BVRI-light curve numerical modeling for five low-mass ratio totally eclipsing contact binary stars. One object required the introduction of a cool star spot to the best-fitting model. Only one object returned a solution with a hotter secondary component. None of the objects required the introduction of a third component.
The true age of multi-planet host star HD 110067: Or: Don't be fooled by K0V-type stars
Fridlund, Malcolm; Jack, Dennis; Schröder, Klaus-Peter +3 more
HD 110067 is a near (d = 32.22 pc, V = 8.43 mag) K0V star in Coma Ber that was recently discovered to host a six-planet system in stable resonances. The star has a very old age of 8+/‑4 Gyr. However, by the nature of the respective evolution tracks (i.e. with masses of 0.78...0.85 M⊙), which run parallel to the zero-age main sequence fo…
Decay Timescales of Chromospheric Condensations in Solar Flare Footpoints
Kowalski, Adam F.; Butler, Elizabeth C.
Chromospheric condensations (CCs) are a prominent feature of flare footpoint heating in the solar flare standard model, yet their timescales and velocities are not well understood. Fisher derived several important analytical relationships, which have rarely been examined with modern spectral observations. The Interface Region Imaging Spectrograph …