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[C II] 158 µm line emission from Orion A. II. Photodissociation region physics
Wolfire, M. G.; Teyssier, D.; Goicoechea, J. R. +10 more
Context. The [C II] 158 µm fine-structure line is the dominant cooling line of moderate-density photodissociation regions (PDRs) illuminated by moderately bright far-ultraviolet (FUV) radiation fields. This makes this line a prime diagnostic for extended regions illuminated by massive stars.
Aims: We aim to understand the origin of [C I…
Correcting Stellar Flare Frequency Distributions Detected by TESS and Kepler
Yang, Ming; Zhou, Ji-Lin; Liu, Hui-Gen +1 more
The habitability of planets is closely connected with stellar activity, mainly the frequency of flares and the distribution of flare energy. Kepler and TESS find many flaring stars via precise time-domain photometric data, and the frequency and energy distribution of stellar flares on different types of stars are studied statistically. However, th…
Planetary nebulae with Wolf-Rayet-type central stars - III. A detailed view of NGC 6905 and its central star
Guerrero, M. A.; Toalá, J. A.; Todt, H. +6 more
We present a multiwavelength characterization of the planetary nebula (PN) NGC 6905 and its [Wolf-Rayet]-type ([WR]) central star (CSPN) HD 193949. Our Nordic Optical Telescope Alhambra Faint Object Spectrograph and Camera (ALFOSC) spectra and images unveil in unprecedented detail the high-ionization structure of NGC 6905. The high-quality spectra…
Phenomenology of CP-even ALP
Sakurai, Kodai; Yin, Wen
Axion or axion-like particle (ALP) has been usually considered as a CP-odd Nambu-Goldstone boson (NGB) from the spontaneous breakdown of a global U(1) symmetry. In this paper, we point out that the NGB behaves as a CP-even particle coupled to the SM particles in a large class of simple (or perhaps the simplest) renormalizable models. We provide a …
TOI-1268b: The youngest hot Saturn-mass transiting exoplanet
Fridlund, M.; Pallé, E.; Guenther, E. W. +41 more
We report the discovery of TOI-1268b, a transiting Saturn-mass planet from the TESS space mission. With an age of less than 1 Gyr, derived from various age indicators, TOI-1268b is the youngest Saturn-mass planet known to date; it contributes to the small sample of well-characterised young planets. It has an orbital period of P = 8.1577080 ± 0.000…
A Dearth of Close-in Stellar Companions to M-dwarf TESS Objects of Interest
Howell, Steve B.; Beichman, Charles A.; Ciardi, David R. +5 more
TESS has proven to be a powerful resource for finding planets, including those that orbit the most prevalent stars in our galaxy: M dwarfs. Identification of stellar companions (both bound and unbound) has become a standard component of the transiting planet confirmation process in order to assess the level of light-curve dilution and the possibil…
Microlensing and the type Ia supernova iPTF16geu
Diego, J. M.; Goobar, A.; Mörtsell, E. +5 more
The observed magnifications and light curves of the quadruply imaged iPTF16geu supernova (SN) offers a unique opportunity to study a lens system with a variety of independent constraints. The four observed positions can be used to constrain the macrolens model. The magnifications and light curves at the four SN positions are more useful to constra…
In-depth direct imaging and spectroscopic characterization of the young Solar System analog HD 95086
Rouan, D.; Ménard, F.; Henning, T. +48 more
Context. HD 95086 is a young nearby Solar System analog hosting a giant exoplanet orbiting at 57 au from the star between an inner and outer debris belt. The existence of additional planets has been suggested as the mechanism that maintains the broad cavity between the two belts.
Aims: We present a dedicated monitoring of HD 95086 with the VL…
Revealing the Field Sub-subgiant Population Using a Catalog of Active Giant Stars and Gaia EDR3
Tofflemire, Benjamin M.; Gully-Santiago, Michael A.; Geller, Aaron M. +2 more
Sub-subgiant stars (SSGs) fall below the subgiant branch and/or red of the giant branch in open and globular clusters, an area of the color-magnitude diagram (CMD) not populated by standard stellar evolution tracks. One hypothesis is that SSGs result from rapid rotation in subgiants or giants due to tidal synchronization in a close binary. The str…
Spectral analysis of cool white dwarfs accreting from planetary systems: from the ultraviolet to the optical
Gänsicke, B. T.; Tremblay, P. -E.; Hollands, M. A. +1 more
The accretion of planetary debris into the atmospheres of white dwarfs leads to the presence of metal lines in their spectra. Cool metal-rich white dwarfs, which left the main sequence many Gyr ago, allow the study of the remnants of the oldest planetary systems. Despite their low effective temperatures (Teff), a non-negligible amount o…