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A Multiwavelength Light-curve Analysis of the Classical Nova YZ Ret: An Extension of the Universal Decline Law to the Nebular Phase
Kato, Mariko; Hachisu, Izumi
YZ Ret is the first X-ray flash detected classical nova, and is also observed in optical, X-ray, and gamma-ray. We propose a comprehensive model that explains the observational properties. The white dwarf mass is determined to be ~1.33 M ☉, which reproduces the multiwavelength light curves of YZ Ret, from optical, X-ray, to gamma-ray. W…
Exploring the low-mass regime of galaxy-scale strong lensing: Insights into the mass structure of cluster galaxies
Grillo, C.; Rosati, P.; Vanzella, E. +8 more
Context. Several recent studies have highlighted a discrepancy between the strong lensing (SL) properties of observed cluster galaxies and the predictions of Λ cold dark matter (CDM) cosmological hydrodynamical simulations. This discrepancy can be interpreted as the result of observed cluster members being more compact than their simulated counter…
A CO funnel in the Galactic centre: Molecular counterpart of the northern Galactic chimney
Menten, K. M.; Schilke, P.; Fuller, G. A. +7 more
We report the discovery of a velocity coherent, funnel-shaped 13CO emission feature in the Galactic centre (GC) using data from the SEDIGISM survey. The molecular cloud appears as a low-velocity structure (VLSR = [ − 3.5, + 3.5] km s−1) with an angular extent of 0.95° ×1°, extending towards positive Galactic latitu…
TOI-4600 b and c: Two Long-period Giant Planets Orbiting an Early K Dwarf
Vanderburg, Andrew; Bieryla, Allyson; Latham, David W. +31 more
We report the discovery and validation of two long-period giant exoplanets orbiting the early K dwarf TOI-4600 (V = 12.6, T = 11.9), first detected using observations from the Transiting Exoplanet Survey Satellite (TESS) by the TESS Single Transit Planet Candidate Working Group. The inner planet, TOI-4600 b, has a radius of 6.80 ± 0.31 R ⊕
Metallicities of Classical Cepheids in the Inner Galactic Disk
Matsunaga, Noriyuki; D'Orazi, Valentina; McWilliam, Andrew +14 more
Metallicity gradients refer to the sloped radial profiles of the metallicities of gas and stars and are commonly seen in disk galaxies. A well-defined metallicity gradient of the Galactic disk is observed particularly well with classical Cepheids, which are good stellar tracers thanks to their period-luminosity relation, allowing precise distance …
A High-precision Survey of the D/H Ratio in the Nearby Interstellar Medium
Tripp, Todd M.; Jenkins, Edward B.; Chayer, Pierre +4 more
We present high signal-to-noise ratio measurements of the H I Lyα absorption line toward 16 Galactic targets that are at distances between approximately 190 and 2200 pc, all beyond the wall of the Local Bubble. We describe the models used to remove stellar emission and absorption features and the methods used to account for all known sources of er…
A Tale of Three Dwarfs: No Extreme Cluster Formation in Extreme Star-forming Galaxies
Whitmore, Bradley C.; Chandar, Rupali; Ubeda, Leonardo +8 more
Nearly all current simulations predict that outcomes of the star formation process, such as the fraction of stars that form in bound clusters (Γ), depend on the intensity of star formation activity (ΣSFR) in the host galaxy. The exact shape and strength of the predicted correlations, however, vary from simulation to simulation. Observat…
Are magnetic fields universal in O-type multiple systems?
Ilyin, I.; Hubrig, S.; Schöller, M. +2 more
Although significant progress has been achieved in recent surveys of the magnetism in massive stars, the origin of the detected magnetic fields remains to be the least understood topic in their studies. We present an analysis of 61 high-resolution spectropolarimetric observations of 36 systems with O-type primaries, among them 10 known particle-ac…
The EBLM project X. Benchmark masses, radii, and temperatures for two fully convective M-dwarfs using K2
Hellier, Coel; Triaud, Amaury H. M. J.; Sairam, Lalitha +23 more
M-dwarfs are the most abundant stars in the galaxy and popular targets for exoplanet searches. However, their intrinsic faintness and complex spectra inhibit precise characterization. We only know of dozens of M-dwarfs with fundamental parameters of mass, radius, and effective temperature characterized to better than a few per cent. Eclipsing bina…
Estimating the number of planets that PLATO can detect
Rauer, H.; Cabrera, J.; Börner, A. +2 more
Context. The PLATO mission is scheduled for launch in 2026. It will monitor more than 245 000 FGK stars of magnitude 13 or brighter for planet transit events. Among the key scientific goals are the detection of Earth-Sun analogs; the detailed characterization of stars and planets in terms of mass, radius, and ages; the detection of planetary syste…