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Pre-impact Albedo Map and Photometric Properties of the (65803) Didymos Asteroid Binary System from DART and Ground-based Data
Buratti, B. J.; Sunshine, J. M.; Rivkin, A. S. +11 more
This study provides a pre-impact map of the albedo of the Double Asteroid Redirection Test (DART) target Dimorphos corrected for all the effects of viewing geometry, as well as an estimate of photometric roughness for the hemisphere imaged by DART. Other photometric properties are derived for the (65803) Didymos binary system based on DART and gro…
HIP 41378 observed by CHEOPS: Where is planet d?
Alonso, R.; Deleuil, M.; Erikson, A. +84 more
HIP 41378 d is a long-period planet that has only been observed to transit twice, three years apart, with K2. According to stability considerations and a partial detection of the Rossiter-McLaughlin effect, Pd = 278.36 d has been determined to be the most likely orbital period. We targeted HIP 41378 d with CHEOPS at the predicted transi…
Multiwavelength study of on-disk coronal-hole jets with IRIS and SDO observations
Koletti, M.; Gontikakis, C.; Patsourakos, S. +1 more
Context. Solar jets are an important field of study, as they may contribute to the mass and energy transfer from the lower to the upper atmosphere. Aims. We use the Interface Region Imaging Spectrograph (IRIS) and Solar Dynamic Observatory (SDO) observations to study two small-scale jets (jet 1 and jet 2) originating in the same on-disk coronal ho…
Confirming long-period transiting exoplanets with TESS and CHEOPS. The case of HD 22946 d
Osborn, H. P.; Garai, Z.; Ulmer-Moll, S. +2 more
Due to the limited observing duration of the Transiting Exoplanet Survey Satellite (TESS) primary mission, which observed the majority of the near-ecliptic sectors for only 27 days, planets on long periods produce only single transits. However, thanks to its extended mission, TESS re-observed the same fields 2 years later, and in many cases was ab…
Mass accretion rate in the jet-driving symbiotic binary MWC 560
Zamanov, R. K.; Marchev, V. D.
We analyze photometric observations of the symbiotic star MWC 560 in B and V bands obtained during the period 1990-2023. We estimate the luminosity and the mass accretion rate of the hot component. We find that the luminosity varies in the range from 200 L⊙ to 3000 L⊙, corresponding to a mass accretion rate in the range 1 × 10−7 − 2 × 10−6 M⊙ yr−1…
The pioneer Cluster mission: preparation of its legacy phase near re-entry
Escoubet, C. Philippe; Masson, Arnaud; Taylor, Matthew G. G. T. +5 more
The Cluster mission will always be the first ever multi-spacecraft mission mapping the Earth magnetosphere in three dimensions. Launched in 2000 and originally planned to operate for two years, it has been orbiting Earth for more than two solar cycles. Over the course of its lifetime, its data have enabled the scientific community to conduct pione…
Large-scale stellar age-velocity spiral pattern in NGC 4030
Brinchmann, Jarle; Krajnović, Davor; Falcón-Barroso, Jesus +11 more
The processes driving the formation and evolution of late-type galaxies continue to be a debated subject in extragalactic astronomy. Investigating stellar kinematics, especially when combined with age estimates, provides crucial insights into the formation and subsequent development of galactic discs. Post-processing of exceptionally high-quality …
Anomalously low-mass core-He-burning star in NGC 6819 as a post-common-envelope phase product
Tailo, Marco; Miglio, Andrea; Montalbán, Josefina +5 more
Precise masses of red giant stars enable a robust inference of their ages, but there are cases where these age estimates are very precise but also very inaccurate. Examples are core-helium-burning (CHeB) stars that have lost more mass than predicted by standard single-star evolutionary models. Members of star clusters in the Kepler database repres…
Disentanglement of the chemodynamical assembly: mapping the Milky Way discs
Teixeira, Ramachrisna; Cantelli, Elvis
The formation and structure of the Milky Way have a fundamental role in our understanding of the universe and its evolution, and thanks to the Gaia mission and large spectroscopic surveys, we live an exceptional moment of data availability, allowing us to trace the building blocks of the Galactic disc and their relations. In this sense, we propose…
Characterisation of TOI-406 as a showcase of the THIRSTEE program: A two-planet system straddling the M-dwarf density gap
Bouchy, F.; Pallé, E.; Zapatero Osorio, M. R. +31 more
Context. The exoplanet sub-Neptune population currently poses a conundrum, as to whether small-size planets are volatile-rich cores without an atmosphere, or rocky cores surrounded by a H-He envelope. To test the different hypotheses from an observational point of view, a large sample of small-size planets with precise mass and radius measurements…