Search Publications
Big Three Dragons: A [N II] 122 µm Constraint and New Dust-continuum Detection of a z = 7.15 Bright Lyman-break Galaxy with ALMA
Fujimoto, Seiji; Inoue, Akio K.; Hashimoto, Takuya +6 more
We present new Atacama Large Millimeter/submillimeter Array Band 7 observational results of a Lyman-break galaxy at z = 7.15, B14-65666 ("Big Three Dragons"), which is an object detected in [O III] 88 µm, [C II] 158 µm, and dust continuum emission during the epoch of reionization. Our targets are the [N II] 122 µm fine-structure …
Exoplanet validation with machine learning: 50 new validated Kepler planets
Armstrong, David J.; Gamper, Jevgenij; Damoulas, Theodoros
Over 30 per cent of the $\sim$4000 known exoplanets to date have been discovered using 'validation', where the statistical likelihood of a transit arising from a false positive (FP), non-planetary scenario is calculated. For the large majority of these validated planets calculations were performed using the VESPA algorithm. Regardless of the stren…
A large sub-Neptune transiting the thick-disk M4 V TOI-2406
Gabor, P.; Queloz, D.; Henning, T. +71 more
Context. Large sub-Neptunes are uncommon around the coolest stars in the Galaxy and are rarer still around those that are metal-poor. However, owing to the large planet-to-star radius ratio, these planets are highly suitable for atmospheric study via transmission spectroscopy in the infrared, such as with JWST.
Aims: Here we report the discov…
Red Supergiants in M31 and M33. I. The Complete Sample
Yang, Ming; Ren, Yi; Jiang, Biwei +3 more
The aim of this paper is to establish a complete sample of red supergiants (RSGs) in M31 and M33. The member stars of the two galaxies are selected from the near-infrared (NIR) point sources after removing the foreground dwarfs from their obvious branch in the J - H/H - K diagram with the archival photometric data taken by the UKIRT/WFCAM. This se…
A high pitch angle structure in the Sagittarius Arm
Castro-Ginard, A.; Benjamin, R. A.; Krone-Martins, A. +6 more
Context. In spiral galaxies, star formation tends to trace features of the spiral pattern, including arms, spurs, feathers, and branches. However, in our own Milky Way, it has been challenging to connect individual star-forming regions to their larger Galactic environment owing to our perspective from within the disk. One feature in nearly all mod…
Horizontal spreading of planetary debris accreted by white dwarfs
Ludwig, Hans-Günter; Gänsicke, Boris T.; Veras, Dimitri +8 more
White dwarfs with metal-polluted atmospheres have been studied widely in the context of the accretion of rocky debris from evolved planetary systems. One open question is the geometry of accretion and how material arrives and mixes in the white dwarf surface layers. Using the three-dimensional (3D) radiation hydrodynamics code CO5BOLD, …
ALMA-IRDC: dense gas mass distribution from cloud to core scales
Avison, A.; Moser, L.; Bigiel, F. +15 more
Infrared dark clouds (IRDCs) are potential hosts of the elusive early phases of high mass star formation (HMSF). Here, we conduct an in-depth analysis of the fragmentation properties of a sample of 10 IRDCs, which have been highlighted as some of the best candidates to study HMSF within the Milky Way. To do so, we have obtained a set of large mosa…
A comparative study of the strength of flickering in cataclysmic variables
Bruch, Albert
Flickering is a universal phenomenon in accreting astronomical systems that still defies detailed physical understanding. It is particularly evident in cataclysmic variables (CVs). Attempting to define boundary conditions for models, the strength of the flickering is measured in several thousand light curves of more than 100 CVs. The flickering am…
TOI-1278 B: SPIRou Unveils a Rare Brown Dwarf Companion in Close-in Orbit around an M Dwarf
Torres, Guillermo; Latham, David W.; Seager, Sara +39 more
We present the discovery of an 18.5 ± 0.5 MJup brown dwarf (BD) companion to the M0V star TOI-1278. The system was first identified through a percent-deep transit in Transiting Exoplanet Survey Satellite photometry; further analysis showed it to be a grazing transit of a Jupiter-sized object. Radial velocity (RV) follow-up with the SPIR…
The role of AGN and obscuration in the position of the host galaxy relative to the main sequence
Shirley, R.; Ciesla, L.; Buat, V. +5 more
We use X-ray active galactic nuclei (AGN) observed by the Chandra X-ray Observatory within the 9.3 deg2 Boötes field of the NDWFS to study whether there is a correlation between X-ray luminosity (LX) and star formation rate (SFR) of the host galaxy, at 0.5 < z < 2.0, with respect to the position of the galaxy to the mai…