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Recent collisional history of (65803) Didymos
Lucchetti, Alice; Pajola, Maurizio; Michel, Patrick +7 more
The Double Asteroid Redirection Test (DART, NASA) spacecraft revealed that the primary of the (65803) Didymos near-Earth asteroid (NEA) binary system is not exactly the expected spinning top shape observed for other km-size asteroids. Ground based radar observations predicted that such shape was compatible with the uncertainty along the direction …
Observations of pre- and proto-brown dwarfs in nearby clouds: Paving the way to further constraining theories of brown dwarf formation
Lee, Chang Won; Dunham, Michael M.; Palau, Aina +2 more
Brown Dwarfs (BDs) are crucial objects in our understanding of both star and planet formation, as well as in our understanding of what mechanisms shape the lower end of the Initial Mass Function (IMF). However, since the discovery of the first BD in 1995, there is still an unconcluded debate about which is the dominant formation mechanism of these…
Detailed Abundances of the Planet-hosting TOI-1173 A/B System: Possible Evidence of Planet Engulfment in a Very Wide Binary
McWilliam, Andrew; Simon, Joshua D.; Reggiani, Henrique +7 more
Over the last decade, studies of large samples of binary systems have identified chemical anomalies and shown that they might be attributed to planet formation or planet engulfment. However, both scenarios have primarily been tested in pairs without known exoplanets. In this work, we explore these scenarios in the newly detected planet-hosting wid…
Sensitivity of the Helioglow to Variation of the Total Ionization Rate and Solar Lyα Emission
Bzowski, M.; Kubiak, M. A.; Kowalska-Leszczynska, I. +1 more
Direct observations of solar wind are mostly limited to the vicinity of the ecliptic plane. Retrieving the latitudinal structure of solar wind indirectly based on observations of the backscatter glow of interstellar neutral hydrogen is complex and requires support from theoretical models. The GLOWS instrument, to operate on the planned IMAP missio…
Evaluation of the astrometric capability of Multi-Channel Imager and simulated calculation of proper motion of M31
Peng, Xiyan; Liao, Shilong; Qi, Zhaoxiang +8 more
Introduction: The Multi-Channel Imager (MCI), one of the back-end modules of the future China Space Station Telescope (CSST), is designed for high-precision spacebased astronomical observations. This paper evaluates the astrometric capability of the MCI based on simulated observational images and Gaia data: the M31 galaxy is selected as a represen…
Ionized X-ray winds in the radio galaxy Mrk 6
Fukazawa, Yasushi; Mao, Junjie; Kayanoki, Taishu
Active galactic nucleus (AGN) outflows including jets and ionized winds have been key phenomena such as jet collimation and AGN feedback to the host galaxy in astrophysics. Radio galaxies, a type of AGN with misaligned jets, have provided valuable insights into the properties and relationships of these outflows. However, several aspects regarding …
Ring nebulae around Wolf-Rayet stars in M33 as seen by SITELLE
Drissen, Laurent; Robert, Carmelle; Rousseau-Nepton, Laurie +5 more
We have conducted an analysis of nebulae around Wolf-Rayet (WR) stars in M33 using data collected by the imaging Fourier transform spectrometer SITELLE at the Canada-France-Hawaii telescope as part of the SIGNALS Large Program. Of the 211 known WR stars in M33, 178 are located in the fields observed in this study. We present the results of this an…
Tracking an Eruptive Prominence Using Multiwavelength and Multiview Observations on 2023 March 7
Song, Yongliang; Huang, Zhenghua; Zhang, Qingmin +2 more
In this paper, we carry out multiwavelength and multiview observations of the prominence eruption, which generated a C2.3 class flare and a coronal mass ejection (CME) on 2023 March 7. For the first time, we apply the revised cone model to three-dimensional reconstruction and tracking of the eruptive prominence for ∼4 hr. The prominence propagates…
Novel constraints on companions to the Helix nebula central star
Lothringer, Joshua D.; Parsons, Steven G.; Rauch, Thomas +3 more
The Helix is a visually striking and the nearest planetary nebula, yet any companions responsible for its asymmetric morphology have yet to be identified. In 2020, low-amplitude photometric variations with a periodicity of 2.8 d were reported based on Cycle 1 TESS observations. In this work, with the inclusion of two additional sectors, these peri…
Indication of a fast ejecta fragment in the atomic cloud interacting with the southwestern limb of SN 1006
Miceli, M.; Bocchino, F.; Orlando, S. +5 more
Context. Supernova remnants interacting with molecular and atomic clouds are interesting X-ray sources for studies of broadband nonthermal emission. X-ray line emission in these systems can be produced by different processes, such as low-energy cosmic rays (LECRs) interacting with the cloud and fast ejecta fragments moving in the cloud.
Aims:…