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HD 7977 and its possible influence on Solar System bodies
Dybczyński, Piotr A.; Królikowska, Małgorzata; de Bruijne, Jos +5 more
Context. In the latest Gaia third data release, one can find extremely small proper motion components for the star HD 7977. This, together with the radial velocity measurement lead to the conclusion that this star passed very close to the Sun in the recent past.
Aims: Such a very close approach of a one solar mass star must have resulted in n…
XMM–NuSTAR Observation and Multiwavelength Spectral Energy Distribution Modeling of Blazar 4FGL J1520.8–0348
Ajello, M.; Tramacere, A.; Marcotulli, L. +1 more
Active galactic nuclei (AGNs) can power relativistic jets, which are called blazars when pointed close to our line of sight. Depending on the presence or absence of emission lines in their optical spectra, blazars are categorized into flat spectrum radio quasars (FSRQs) or BL Lacertae (BL Lac) objects. According to the "blazar sequence," as synchr…
Investigating the extinction and magnetic field geometry in the Bok globule CB26
Medhi, B. J.; Mazarbhuiya, A. M.; Das, H. S. +2 more
This study investigates the extinction properties, dust distribution, and magnetic field characteristics of the CB26 cloud. Extinction mapping, derived from near-infrared photometry, reveals a good correlation with the dust distribution, as traced by Herschel1SPIRE 500
An ultraviolet spectral study of fullerene-rich planetary nebulae
García-Hernández, D. A.; Gómez-Muñoz, M. A.; Manchado, A. +2 more
Several planetary nebulae (PNe) have been found to contain both polycyclic aromatic hydrocarbon (PAH-like) species and fullerenes (C60) distinguished by their mid-infrared emission. Previous laboratory and astronomical studies suggest that the formation of both species could be related to the decomposition, by photochemical processing, …
Discovery of the Remarkably Red L/T Transition Object VHS J183135.58-551355.9
Meisner, Aaron M.; Kirkpatrick, J. Davy; Burgasser, Adam J. +13 more
We present the discovery of VHS J183135.58‑551355.9 (hereafter VHS J1831‑5513), an L/T transition dwarf identified as a result of its unusually red near-infrared colors (J ‑ K S = 3.633 ± 0.277 mag; J ‑ W2 = 6.249 ± 0.245 mag) from the VISTA Hemisphere Survey and CatWISE2020 surveys. We obtain low-resolution near-infrared spectroscopy o…
Spectroastrometric Survey of Protoplanetary Disks with Inner Dust Cavities
Banzatti, Andrea; Najita, Joan R.; Brittain, Sean D. +6 more
We present high-resolution spectra and spectroastrometric (SA) measurements of fundamental rovibrational CO emission from nine nearby (≲300 pc) protoplanetary disks where large inner dust cavities have been observed. The emission-line profiles and SA signals are fit with a slab disk model that allows the eccentricity of the disk and intensity of t…
The Detection of Possible Quasiperiodic Oscillations in the BL Lac 4FGL J2139.4‑4235
Gong, Yunlu; Gao, Quangui; Li, Xiaopan +9 more
We present periodicity search analyses on the long-term γ-ray light curve of the BL Lacertae object 4FGL J2139.4‑4235 observed by the Fermi Large Area Telescope, over a period of more than 15 yr, from 2008 August 4 to 2023 December 10. To determine the quasiperiodic oscillation (QPO) behavior of 4FGL J2139.4‑4235 in the 0.3–300 GeV energy range, w…
Role of ionizing background and galactic feedback in the redshift space clustering of O VI absorbers in hydrodynamical simulations
Srianand, Raghunathan; Maitra, Soumak; Mallik, Sukanya
We explore the effect of ionizing ultraviolet background (UVB) on the redshift space clustering of low-z (z ≤ 0.5) O VI absorbers using the Sherwood simulations incorporating 'WIND' (i.e. outflows driven by stellar feedback)-only and 'WIND + AGN (active galactic nucleus)' feedback. These simulations show positive clustering signals up to a scale o…
Variable white dwarfs in TMTS: asteroseismological analysis of a ZZ Ceti star, TMTS J17184064+2524314
Shi, Jianrong; Filippenko, Alexei V.; Esamdin, Ali +24 more
The Tsinghua University-Ma Huateng Telescope for Survey (TMTS) has been constantly monitoring the northern sky since 2020 in search of rapidly variable stars. To find variable white dwarfs (WDs), the TMTS catalogue is cross-matched with the WD catalogue of Gaia EDR3, resulting in over 3000 light curves of WD candidates. The WD TMTS J17184064+25243…
On the Response of the Transition Region and the Corona to Rapid Excursions in the Chromosphere
Pereira, T. M. D.; Mathew, S. K.; Louis, R. E. +2 more
Spicules are the thin hair/grass-like structures that are prominently observed at the chromospheric solar limb. It is believed that fibrils and rapid blueshifted and redshifted excursions (RBEs and RREs; collectively referred to as REs) correspond to on-disk counterparts of type I spicules and type II spicules, respectively. Our investigation focu…