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Discovery and Characterization of an Eccentric, Warm Saturn Transiting the Solar Analog TOI-4994
Trifonov, Trifon; Henning, Thomas; Latham, David W. +46 more
We present the detection and characterization of TOI-4994b (TIC 277128619b), a warm Saturn-sized planet discovered by the NASA Transiting Exoplanet Survey Satellite. TOI-4994b transits a G-type star (V = 12.6 mag) with a mass, radius, and effective temperature of
The Y dwarf population with HST: unlocking the secrets of our coolest neighbours - II. Parallaxes and proper motions
Bedin, Luigi R.; Bardalez Gagliuffi, Daniella C.; Albert, Loïc +1 more
We present astrometric results from a Hubble Space Telescope (HST) campaign aimed at determining precise distances for cold Y-type brown dwarfs. Combining observations from a dedicated HST/WFC3 programme with archival data, we derive astrometric solutions for 15 nearby Y dwarfs, by linking the high-precision relative astrometry from Hubble to the …
Solar orbiter: a short review of the mission and early science results
Müller, Daniel; Harra, Louise
On 9 February 2020 at 11:03 pm EST, an Atlas V 411 rocket launched the ESA/ NASA Solar Orbiter mission. This mission was the culmination of decades of work across many countries to achieve the goal of getting close to the Sun and measuring how the Sun creates and maintains the heliosphere. The mission's goal is to understand how the inner heliosph…
Derivation and Application of a Scaling between Hinode/SP and SDO/HMI Vector Magnetic Fields to Improve Magnetic Field Extrapolations
Yalim, M. S.; Hu, Q.; Prasad, A. +3 more
Full-disk measurements of the solar magnetic field by the Helioseismic and Magnetic Imager (HMI) are often used for magnetic field extrapolations, but its limited spatial and spectral resolution can lead to significant errors. We compare HMI data with observations of NOAA 12104 by the Hinode Spectropolarimeter (SP) to derive a scaling curve for th…
Gaia vbroad: Spectral-line broadening and binarity
Mazeh, T.; Faigler, S.; Brown, A. G. A. +1 more
The Gaia DR3 catalogue includes line-broadening measurements (vbroad) for 3 524 677 stars. We concentrate here on the low-mass main-sequence (MS) sub-sample of the catalogue, with (GBP ‑ GRP)0 in the range of 1–1.6, which includes 81 371 sources. The colour-magnitude diagram of the sample displays two distinct stri…
TOI-5108 b and TOI 5786 b: Two transiting sub-Saturns detected and characterized with TESS, MaHPS, and SOPHIE
Ikuta, Kai; Bieryla, Allyson; Latham, David W. +44 more
We report the discovery and characterization of two sub-Saturns from the Transiting Exoplanet Survey Satellite (TESS) using high- resolution spectroscopic observations from the MaHPS spectrograph at the Wendelstein Observatory and the SOPHIE spectrograph at the Haute-Provence Observatory. Combining photometry from TESS, KeplerCam, LCOGT, and MuSCA…
Rotation period estimates for 14 asteroids with the Earth MOID less than 1.1 AU
Eglitis, Ilgmars; Svincicka, Darja
In the present study, the Lomb–Scargle Scargle (L–S) method was employed for the analysis of brightness measurements from multiple observatories as published in the Minor Planet Center (MPC) circulars, as well as brightness measurements from the Baldone Observatory, to determine the periods of asteroids. The periods of fifteen asteroids were deter…
Time-series Spectroscopy and TESS Photometry of the Oscillating Eclipsing Algol System V389 Cassiopeiae
Koo, Jae-Rim; Awiphan, Supachai; Hong, Kyeongsoo +4 more
We present the results from a detailed analysis of our time-series spectroscopic observations and the Transiting Exoplanet Survey Satellite (TESS) photometric data of the eclipsing binary V389 Cas. The radial velocities (RVs) of the primary and faint secondary components were obtained from a total of 61 high-resolution spectra made between 2016 an…
Dependence of Multiband Absolute Magnitudes and Color Indexes of the Tip of the Red Giant Branch Stars on Metallicity in Galactic Globular Clusters
Wang, Shu; Shao, Zhenzhen; Jiang, Biwei +3 more
The tip of the red giant branch (TRGB) stars have attracted intensive attention in recent years because their I-band absolute magnitudes, MI, are often used for distance calibration in the Hubble constant measurements because of its almost independence on metallicity ([Fe/H]). However, a discrepancy exists between various studies, and t…
Discovery of a Jupiter Analog Misaligned to the Inner Planetary System in HD 73344
Huber, Daniel; Saunders, Nicholas; Fulton, Benjamin J. +6 more
We present the discovery of a Jupiter-like planet, HD 73344 d (