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Investigating the long secondary period phenomenon with the ASAS-SN and Gaia data
Pawlak, Michał; Mowlavi, Nami; Eyer, Laurent +1 more
Aims: The aim of this work is to create a complete list of sources exhibiting a long secondary period (LSP) in the ASAS-SN catalog of variable stars, and analyze the properties of this sample compared to other long period variables without an LSP.
Methods: We used the period-amplitude diagram to identify the 55 572 stars showing an LSP, …
A binary system in the S cluster close to the supermassive black hole Sagittarius A*
Eckart, Andreas; Zajaček, Michal; Labadie, Lucas +4 more
High-velocity stars and peculiar G objects orbit the central supermassive black hole (SMBH) Sagittarius A* (Sgr A*). Together, the G objects and high-velocity stars constitute the S cluster. In contrast with theoretical predictions, no binary system near Sgr A* has been identified. Here, we report the detection of a spectroscopic binary system in …
Indications of an offset merger in Abell 3667
Okabe, N.; Simionescu, A.; Fujita, Y. +13 more
Context. Cluster mergers are the most energetic events, releasing kinetic energies of up to 1064 erg and involving megaparsec(Mpc)-scale shocks in their intra-cluster medium (ICM). In merging clusters, cold fronts are frequently observed, which are characterized by temperature and density jumps while maintaining constant pressure. They,…
Discovery of two warm mini-Neptunes with contrasting densities orbiting the young K3V star TOI-815
Helling, Christiane; Hellier, Coel; Charnoz, Sébastien +130 more
We present the discovery and characterization of two warm mini-Neptunes transiting the K3V star TOI-815 in a K–M binary system. Analysis of its spectra and rotation period reveal the star to be young, with an age of 200‑200+400 Myr. TOI-8l5b has a 11.2-day period and a radius of 2.94 ± 0.05 R⊕ with transits observe…
Characterization of starspots on a young M-dwarf K2-25: multiband observations of stellar photometric variability and planetary transits
Ikuta, Kai; Tamura, Motohide; Livingston, John H. +13 more
Detailed atmospheric characterization of exoplanets by transmission spectroscopy requires careful consideration of stellar surface inhomogeneities induced by star-spots. This effect is particularly problematic for planetary systems around M-dwarfs, and their spot properties are not fully understood. We investigated the stellar activity of the youn…
Ly α emission strength and stellar properties of faint galaxies from 5 < z < 8.2
Pentericci, Laura; Treu, Tommaso; Jones, Gareth C. +6 more
We present a study on stellar properties of Lyman-alpha (Ly α) emitters at 5 < z < 8.2. We use 247 photometrically selected, lensed, high-redshift, low-luminosity galaxy candidates with spectroscopic follow-up. Of these, 38 are confirmed spectroscopically to be between 5 < z < 8.2 via detection of Ly α. For each galaxy and candidate, w…
A Comprehensive Study of Open Cluster Chemical Homogeneity Using APOGEE and Milky Way Mapper Abundances
Cunha, Katia; Souto, Diogo; Tayar, Jamie +4 more
Stars in an open cluster are assumed to have formed from a broadly homogeneous distribution of gas, implying that they should be chemically homogeneous. Quantifying the level to which open clusters are chemically homogeneous can therefore tell us about interstellar medium pollution and gas mixing in progenitor molecular clouds. Using Sloan Digital…
Spatial Variations of Dust Opacity and Grain Growth in Dark Clouds: L1689, L1709, and L1712
Chen, Xi; Jiang, Biwei; Zhao, He +2 more
The far-infrared (FIR) opacity of dust in dark clouds within the Ophiuchus molecular cloud is investigated through multiwavelength infrared observations from UKIDSS, Spitzer, and Herschel. Employing the infrared color excess technique with both near-infrared and mid-infrared photometric data, a high-resolution extinction map in the K band (A …
NGTS-30b/TOI-4862b: An 1 Gyr old 98-day transiting warm Jupiter
Bouchy, F.; Alves, D. R.; Henning, T. +63 more
Context. Long-period transiting exoplanets bridge the gap between the bulk of transit- and Doppler-based exoplanet discoveries, providing key insights into the formation and evolution of planetary systems. The wider separation between these planets and their host stars results in the exoplanets typically experiencing less radiation from their host…
Ionospheric irregularities at Jupiter observed by JWST
Hueso, R.; Sánchez-Lavega, A.; Fletcher, L. N. +22 more
Jupiter's upper atmosphere is composed of a neutral thermosphere and charged ionosphere. In the latter, the dominant molecular ion H3+ emits in the near-infrared, allowing for the remote exploration of the physical properties of the upper atmosphere. However, the Jovian low-latitude ionosphere remains largely unexplored becau…