Search Publications
Water production rates from SOHO/SWAN observations of comets C/2020 S3 (Erasmus), C/2021 A1 (Leonard) and C/2021 O3 (PanSTARRS)
Bertaux, J. -L.; Combi, M. R.; Quémerais, E. +2 more
In 2021 and 2022 the hydrogen comae of three long period comets, C/2020 S3 (Erasmus), C/2021 A1 (Leonard) and C/2021 O3 (PanSTARRS) were observed with the Solar Wind ANisotropies (SWAN) all-sky hydrogen Lyman-alpha camera on the SOlar and Heliosphere Observer (SOHO) satellite. SWAN obtains nearly daily full-sky images of the hydrogen Lyman-α distr…
Star formation in the centre of NGC 1808 as observed by ALMA
Chen, Guangwen; Kong, Xu; Bendo, George J. +2 more
We present Atacama Large Millimeter/submillimeter Array (ALMA) observations of 85.69- and 99.02-GHz continuum emission and H42α and H40α lines emission from the central 1 kpc of NGC 1808. These forms of emission are tracers of photoionizing stars but unaffected by dust obscuration that we use to test the applicability of other commonly star format…
Luminosity Outburst of a High-mass Young Stellar Object Triggered by the Surrounding Radiation Field
Liu, Jun-Ting; Chen, Xi; Li, Bin +8 more
We present observations of the 6.7 GHz methanol and 4.8 GHz formaldehyde masers toward the high-mass young stellar object G24.33+0.14 (hereafter G24). Our observations were conducted from 2019 to 2021 using the Shanghai Tianma 65 m Radio Telescope and the Very Large Array in response to the luminosity outburst event traced by these two species mas…
Suzaku spectral analysis of an X-ray emitting plasma in the supernova remnant G352.7-0.1
Nobukawa, Masayoshi; Nobukawa, Kumiko K.; Yamauchi, Shigeo +1 more
The results of a Suzaku observation of the supernova remnant (SNR) G352.7-0.1 are presented in this paper. We conducted spectral analysis based on careful sky background estimation and found an emission line from Al at 1.6 keV, in addition to previously detected emission lines from Mg, Si, S, Ar, Ca, and Fe ions. The X-ray spectrum in the 0.7-10 k…
Machine learning methods for the search for L&T brown dwarfs in the data of modern sky surveys
Avdeeva, A.
According to various estimates, brown dwarfs (BD) should account for up to 25 percent of all objects in the Galaxy. However, few of them are discovered and well-studied, both individually and as a population. Homogeneous and complete samples of brown dwarfs are needed for these kinds of studies. Due to their weakness, spectral studies of brown dwa…
Three-dimensional Orbit of AC Her Determined: Binary-induced Truncation Cannot Explain the Large Cavity in This Post-AGB Transition Disk
Klement, Robert; Mérand, Antoine; Monnier, John D. +17 more
Some evolved binaries, namely post-asymptotic giant branch (AGB) binaries, are surrounded by stable and massive circumbinary disks similar to protoplanetary disks found around young stars. Around 10% of these disks are transition disks: they have a large inner cavity in the dust. Previous interferometric measurements and modeling have ruled out th…
The truncation of the disk of NGC 4565. Detected up to z = 4 kpc, with star formation, and affected by the warp
Trujillo, Ignacio; Borlaff, Alejandro S.; Comerón, Sébastien +5 more
Context. The hierarchical model of galaxy formation suggests that galaxies are continuously growing. However, our position inside the Milky Way prevents us from studying the disk edge. Truncations are low surface brightness features located in the disk outskirts of external galaxies. They indicate where the disk brightness abruptly drops, and thei…
Remote Sensing and Data Analyses on Planetary Topography
Lin, Shih-Yuan; Xiao, Haifeng; Kim, Jungrack
Planetary mapping product established by topographic remote sensing is one of the most significant achievements of contemporary technology. Modern planetary remote sensing technology now measures the topography of familiar solid planets/satellites such as Mars and the Moon with sub-meter precision, and its applications extend to the Kuiper Belt of…
Discovering New B[e] Supergiants and Candidate Luminous Blue Variables in Nearby Galaxies
Bonanos, Alceste Z.; Maravelias, Grigoris; Tramper, Frank +3 more
Mass loss is one of the key parameters that determine stellar evolution. Despite the progress we have achieved over the last decades we still cannot match the observational derived values with theoretical predictions. Even worse, there are certain phases, such as the B[e] supergiants (B[e]SGs) and the Luminous Blue Variables (LBVs), where signific…
Metallicity and Spectral Evolution of WASP 39b: The Limited Role of Hydrodynamic Escape
Miguel, Yamila; Kubyshkina, Daria; Louca, Amy J.
The recent observations on WASP-39 b by JWST have revealed hints of high metallicity within the atmosphere compared to its host star. There are various theories on how these high metallic atmospheres emerge. In this study, we closely investigate the impact of extreme escape in the form of hydrodynamic escape to see its impact on atmospheric metall…