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TOI-220 b: a warm sub-Neptune discovered by TESS
Bouchy, F.; Deeg, H.; Deleuil, M. +77 more
In this paper, we report the discovery of TOI-220 b, a new sub-Neptune detected by the Transiting Exoplanet Survey Satellite (TESS) and confirmed by radial velocity follow-up observations with the HARPS spectrograph. Based on the combined analysis of TESS transit photometry and high precision radial velocity measurements, we estimate a planetary m…
Multiwavelength view of SPT-CL J2106-5844. The radio galaxies and the thermal and relativistic plasmas in a massive galaxy cluster merger at z ≃ 1.13
Koribalski, Bärbel S.; Churazov, Eugene; Hopkins, Andrew M. +12 more
Context. SPT-CL J2106-5844 is among the most massive galaxy clusters at z > 1 yet discovered. While initially used in cosmological tests to assess the compatibility with Λ Cold Dark Matter cosmology of such a massive virialized object at this redshift, more recent studies indicate SPT-CL J2106-5844 is undergoing a major merger and is not an iso…
Magnetic properties on the boundary of an evolving pore
Jurčák, J.; Bello González, N.; García-Rivas, M.
Context. Analyses of the magnetic properties on umbrae boundaries have led to the Jurčák criterion, which states that umbra-penumbra boundaries in stable sunspots are equally defined by a constant value of the vertical magnetic field, Bvercrit, and by a 50% continuum intensity of the quiet Sun, IQS. Umbrae with ver…
Quiet-Sun Mg II h and k Line Profiles Derived from IRIS Full-Sun Mosaics. I. Reference Profiles and Center-to-limb Variation
Heinzel, Petr; Gunár, Stanislav; Koza, Július +2 more
We derived high-precision reference profiles of the Mg II h and k lines that represent the quiet Sun during a minimum of the solar activity. To do so, we used the broad catalog of full-Sun mosaics obtained by the Interface Region Imaging Spectrograph (IRIS). To minimize the influence of the local variations due to the on-disk solar features and to…
Detailed analysis of the poorly studied northern open cluster NGC 1348 using multi-color photometry and GAIA EDR3 astrometry
Rangwal, Geeta; Zhu, Qingfeng; Jiang, Ing-Guey +5 more
The membership determination for open clusters in noisy environments of the Milky Way is still an open problem. In this paper, our main aim is to provide the membership probability of stars using proper motions and parallax values of stars using Gaia Third Data Release astrometry. Apart from the Gaia astrometry, we have also used other photometric…
Spatially Resolving the Star Formation Histories of Three Nearby Nuclear Star Clusters
Neumayer, Nadine; Kacharov, Nikolay; Seth, Anil C. +4 more
The formation of nuclear star clusters (NSCs) remains an open question. In this work, we use spatially-resolved HST/STIS spectroscopic observations of three nearby NSCs (hosted by NGC 5102, NGC 5206, and NGC 205) to constrain their formation histories by exploring radial variations of the stellar populations within each cluster. Utilizing full-spe…
The GRAVITY young stellar object survey. IV. The CO overtone emission in 51 Oph at sub-au scales
Genzel, R.; Sturm, E.; Labadie, L. +69 more
Context. 51 Oph is a Herbig Ae/Be star that exhibits strong near-infrared CO ro-vibrational emission at 2.3 µm, most likely originating in the innermost regions of a circumstellar disc.
Aims: We aim to obtain the physical and geometrical properties of the system by spatially resolving the circumstellar environment of the inner gaseous d…
Unlocking the Origins of Ultracool Dwarf Radio Emission
Hughes, A. G.; White, J. A.; Boley, A. C. +2 more
Empirical trends in stellar X-ray and radio luminosities suggest that low-mass ultracool dwarfs (UCDs) should not produce significant radio emission. Defying these expectations, strong nonthermal emission has been observed in a few UCDs in the 1-10 GHz range, with a variable component often attributed to global aurorae and a steady component attri…
Multiwavelength dissection of a massive heavily dust-obscured galaxy and its blue companion at z∼2
Daddi, E.; Béthermin, M.; Ciesla, L. +4 more
Aims: We study a system of two galaxies, Astarte and Adonis, at z ∼ 2. At this time, the Universe was undergoing the peak of its star formation activity. Astarte is a dusty star-forming galaxy at the massive end of the main sequence (MS), and Adonis is a less massive companion galaxy that is bright in the ultraviolet and has an optical spectr…
The Stars of the HETDEX Survey. I. Radial Velocities and Metal-poor Stars from Low-resolution Stellar Spectra
Finkelstein, Steven L.; Casey, Caitlin M.; Schneider, Donald P. +19 more
The Hobby-Eberly Telescope Dark Energy Experiment (HETDEX) is an unbiased, massively multiplexed spectroscopic survey, designed to measure the expansion history of the universe through low-resolution (R ∼ 750) spectra of Lyα emitters. In its search for these galaxies, HETDEX will also observe a few times 105 stars. In this paper, we pre…