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A λ 3 mm Line Survey toward the Circumstellar Envelope of the Carbon-rich AGB Star IRC+10216 (CW Leo)
Zhang, Yong; Zhou, Jianjun; Szczerba, Ryszard +14 more
We present an unbiased λ 3 mm spectral line survey (between 84.5 and 115.8 GHz), conducted by the Purple Mountain Observatory 13.7 m radio telescope, together with updated modeling results, toward the carbon-rich asymptotic giant branch star IRC+10216 (CW Leo). A total of 75 spectral lines (96 transitions) are detected, and identified to arise fro…
Magnetic field at the Galactic centre from multiwavelength dust polarization
Hoang, Thiem; Akshaya, M. S.
We have mapped the magnetic field (B-field) for a region of about 30 pc around the centre of our Galaxy, which encompasses the circumnuclear disc (CND), the minispiral, and the 20 and 50 km s-1 molecular clouds, using thermal dust polarization observations obtained from SOFIA/HAWC+ and JCMT/SCUPOL. We decompose the spectra of 12
Disk Evolution Study Through Imaging of Nearby Young Stars (DESTINYS): HD 34700 A unveils an inner ring
Rab, C.; Ginski, C.; Dominik, C. +18 more
Context. The study of protoplanetary disks is fundamental to understand their evolution and interaction with the surrounding environment, and to constrain planet formation mechanisms.
Aims: We aim to characterise the young binary system HD 34700 A, which shows a wealth of structures.
Methods: Taking advantage of the high-contrast imaging…
SuperCAM CO(3-2) APEX survey at a 6 pc resolution in the Small Magellanic Clouds
Bolatto, A. D.; Rubio, M.; Bergman, P. +9 more
Context. The Small Magellanic Cloud (SMC) is an ideal laboratory for studying the properties of star-forming regions thanks to its low metallicity, which has an impact on the molecular gas abundance. However, a small number of molecular gas surveys of the entire galaxy have been carried out in the last few years, limiting the measurements of inter…
Linking High-z and Low-z: Are We Observing the Progenitors of the Milky Way with JWST?
Marconi, Alessandro; Salvadori, Stefania; Rusta, Elka +2 more
The recent JWST observation of the Firefly Sparkle at z = 8.3 offers a unique opportunity to link the high- and the low-z Universe. Indeed, the claim of it being a Milky Way (MW) type of assembly at the cosmic dawn opens the possibility of interpreting the observation with locally calibrated galaxy-formation models. Here, we use the a state-of-the…
Pulsating hydrogen-deficient white dwarfs and pre-white dwarfs observed with TESS. VI. Asteroseismology of the GW Vir-type central star of the Planetary Nebula NGC 246
Córsico, Alejandro H.; Bell, Keaton J.; Uzundag, Murat +7 more
Context. Significant advances have been achieved through the latest improvements in the photometric observations accomplished by the recent space missions, which substantially boost the study of pulsating stars via asteroseismology. The TESS mission has already proven to be of particular relevance for pulsating white dwarf and pre-white dwarf star…
CARMENES input catalogue of M dwarfs: VIII. Kinematics in the solar neighbourhood
Amado, P. J.; Caballero, J. A.; Reiners, A. +15 more
Aims. Our goals are to characterise the kinematic properties and to identify young and old stars among the M dwarfs of the CARMENES input catalogue. Methods. We compiled the spectral types, proper motions, distances, and radial velocities for 2187 M dwarfs. We used the public code SteParKin to derive their galactic space velocities and identify me…
Sensor noise in L I S A P a t h f i n d e r : Laser frequency noise and its coupling to the optical test mass readout
Mendes, L.; Russano, G.; Sanjuan, J. +84 more
The LISA Pathfinder (LPF) mission successfully demonstrated the feasibility of the technology needed for the future space borne gravitational wave observatory LISA. A key subsystem under study was the laser interferometer, which measured the changes in relative distance in between two test masses (TMs). It achieved a sensitivity of 32.0-1.7
TOI-2490b - the most eccentric brown dwarf transiting in the brown dwarf desert
Trifonov, Trifon; Henning, Thomas; Ramsay, Gavin +40 more
We report the discovery of the most eccentric transiting brown dwarf in the brown dwarf desert, TOI-2490b. The brown dwarf desert is the lack of brown dwarfs around main-sequence stars within
A Comparative Study between M30 and M92: M92 is a Merger Remnant with a Large Helium Enhancement
Lee, Jae-Woo
We perform a comparative study of the ex situ second-parameter pair globular clusters (GCs) M30 and M92, having similar metallicities but different horizontal branch morphologies. We obtain similar mean primordial carbon abundances for both clusters. However, M92 shows a large dispersion in carbon due to a more extended C–N anticorrelation, while …