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LEGO - II. A 3 mm molecular line study covering 100 pc of one of the most actively star-forming portions within the Milky Way disc
Weiss, A.; Evans, N. J.; Goldsmith, P. F. +20 more
The current generation of (sub)mm-telescopes has allowed molecular line emission to become a major tool for studying the physical, kinematic, and chemical properties of extragalactic systems, yet exploiting these observations requires a detailed understanding of where emission lines originate within the Milky Way. In this paper, we present 60 arcs…
A Joint Mass-Radius-Period Distribution of Exoplanets
Rogers, Leslie A.; Neil, Andrew R.
The radius-period distribution of exoplanets has been characterized by the Kepler survey, and the empirical mass-radius relation by the subset of Kepler planets with mass measurements. We combine the two in order to constrain the joint mass-radius-period distribution of Kepler transiting planets. We employ hierarchical Bayesian modeling and mixtur…
The Radial Acceleration Relation in CLASH Galaxy Clusters
Donahue, Megan; Umetsu, Keiichi; Chiu, I. -Non +2 more
The radial acceleration relation (RAR) in galaxies describes a tight empirical scaling law between the total acceleration ${g}_{\mathrm{tot}}(r)={{GM}}_{\mathrm{tot}}(\lt r)/{r}^{2}$ observed in galaxies and that expected from their baryonic mass ${g}_{\mathrm{bar}}(r)={{GM}}_{\mathrm{bar}}(\lt r)/{r}^{2}$, with a characteristic acceleration scale…
Planet Hunters TESS I: TOI 813, a subgiant hosting a transiting Saturn-sized planet on an 84-day orbit
Aigrain, S.; Fridlund, M.; Barragán, O. +47 more
We report on the discovery and validation of TOI 813 b (TIC 55525572 b), a transiting exoplanet identified by citizen scientists in data from NASA's Transiting Exoplanet Survey Satellite (TESS) and the first planet discovered by the Planet Hunters TESS project. The host star is a bright (V = 10.3 mag) subgiant (R\star - 1.94 R⊙
A hot terrestrial planet orbiting the bright M dwarf L 168-9 unveiled by TESS
Bouchy, F.; de Medeiros, J. R.; Butler, R. P. +67 more
We report the detection of a transiting super-Earth-sized planet (R = 1.39 ± 0.09 R⊕) in a 1.4-day orbit around L 168-9 (TOI-134), a bright M1V dwarf (V = 11, K = 7.1) located at 25.15 ± 0.02 pc. The host star was observed in the first sector of the Transiting Exoplanet Survey Satellite (TESS) mission. For confirmation and planet mass m…
The single-sided pulsator CO Camelopardalis
Handler, G.; Vanderburg, A.; Giarrusso, M. +10 more
CO Cam (TIC 160268882) is the second 'single-sided pulsator' to be discovered. These are stars where one hemisphere pulsates with a significantly higher amplitude than the other side of the star. CO Cam is a binary star comprised of an Am δ Sct primary star with Teff = 7070 ± 150 K, and a spectroscopically undetected G main-sequence sec…
Age dating the Galactic bar with the nuclear stellar disc
Kawata, Daisuke; Baba, Junichi
From the decades of the theoretical studies, it is well known that the formation of the bar triggers the gas funnelling into the central sub-kpc region and leads to the formation of a kinematically cold nuclear stellar disc (NSD). We demonstrate that this mechanism can be used to identify the formation epoch of the Galactic bar, using an N-body/hy…
Performance Verification of the EXtreme PREcision Spectrograph
Ong, J. M. Joel; Fischer, Debra A.; Buchhave, Lars A. +22 more
The EXtreme PREcision Spectrograph (EXPRES) is a new Doppler spectrograph designed to reach a radial-velocity measurement precision sufficient to detect Earth-like exoplanets orbiting nearby, bright stars. We report on extensive laboratory testing and on-sky observations to quantitatively assess the instrumental radial-velocity measurement precisi…
Is π Men c’s Atmosphere Hydrogen-dominated? Insights from a Non-detection of H I Lyα Absorption
Rauer, H.; Gandolfi, D.; Fossati, L. +3 more
Constraining the composition of super-Earth-to-sub-Neptune-sized planets is a priority in order to understand the processes of planetary formation and evolution. π Men c represents a unique target for the atmospheric and compositional characterization of such planets because it is strongly irradiated and its bulk density is consistent with abundan…
Formation of the Musca filament: evidence for asymmetries in the accretion flow due to a cloud-cloud collision
Arzoumanian, D.; Schneider, N.; Csengeri, T. +11 more
Context. Dense molecular filaments are ubiquituous in the interstellar medium, yet their internal physical conditions and the role of gravity, turbulence, the magnetic field, radiation, and the ambient cloud during their evolution remain debated.
Aims: We study the kinematics and physical conditions in the Musca filament, the ambient cloud, a…