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The extended molecular envelope of the asymptotic giant branch star π1 Gruis as seen by ALMA. I. Large-scale kinematic structure and CO excitation properties
Lindqvist, M.; Höfner, S.; Wittkowski, M. +8 more
Context. The S-type asymptotic giant branch (AGB) star π1 Gru has a known companion at a separation of 2.̋7 (≈400 AU). Previous observations of the circumstellar envelope (CSE) show strong deviations from spherical symmetry. The envelope structure, including an equatorial torus and a fast bipolar outflow, is rarely seen in the AGB phase …
PHIBSS: exploring the dependence of the CO-H2 conversion factor on total mass surface density at z<1.5
Weiner, Benjamin J.; Sandstrom, Karin M.; Freundlich, Jonathan +10 more
We present an analysis of the relationship between the CO-H2 conversion factor (αCO) and total mass surface density (Σtot) in star-forming galaxies at z < 1.5. Our sample, which is drawn from the IRAM Plateau de Bure HIgh-z Blue Sequence Survey (PHIBSS) and the CO Legacy Database for GASS (COLD GASS), includes '…
Centroid vetting of transiting planet candidates from the Next Generation Transit Survey
Wheatley, Peter J.; Bayliss, Daniel; Moyano, Maximiliano +25 more
The Next Generation Transit Survey (NGTS), operating in Paranal since 2016, is a wide-field survey to detect Neptunes and super-Earths transiting bright stars, which are suitable for precise radial velocity follow-up and characterization. Thereby, its sub-mmag photometric precision and ability to identify false positives are crucial. Particularly,…
Spatially resolved CO SLED of the Luminous Merger Remnant NGC 1614 with ALMA
Aalto, Susanne; Yun, Min S.; Kaneko, Hiroyuki +13 more
We present high-resolution (1.″0) Atacama Large Millimeter/submillimeter Array (ALMA) observations of CO (1-0) and CO (2-1) rotational transitions toward the nearby IR-luminous merger NGC 1614 supplemented with ALMA archival data of CO (3-2) and CO (6-5) transitions. The CO (6-5) emission arises from the starburst ring (central 590 pc in radius), …
Freely Expanding Knots of X-Ray-emitting Ejecta in Kepler’s Supernova Remnant
Sato, Toshiki; Hughes, John P.
We report measurements of proper motion, radial velocity, and elemental composition for 14 compact X-ray-bright knots in Kepler’s supernova remnant (SNR) using archival Chandra data. The knots with the highest speed show both large proper motions (µ ∼ 0.″11-0.″14 yr-1) and high radial velocities (v ∼ 8700-10,020 km s-1)…
The Betelgeuse Project: constraints from rotation
Zhou, L.; Wheeler, J. Craig; Nance, S. +6 more
In order to constrain the evolutionary state of the red supergiant Betelgeuse (α Orionis), we have produced a suite of models with zero-age main sequence masses from 15 to 25 M⊙ in intervals of 1 M⊙ including the effects of rotation. The models were computed with the stellar evolutionary code MESA. For non-rotating models, we…
A Statistical Analysis of the Solar Phenomena Associated with Global EUV Waves
Long, D. M.; Carley, E. P.; Pérez-Suárez, D. +2 more
Solar eruptions are the most spectacular events in our solar system and are associated with many different signatures of energy release including solar flares, coronal mass ejections, global waves, radio emission and accelerated particles. Here, we apply the Coronal Pulse Identification and Tracking Algorithm (CorPITA) to the high-cadence synoptic…
Non-minimal derivative coupling scalar field and bulk viscous dark energy
Mostaghel, Behrang; Moshafi, Hossein; Movahed, S. M. S.
Inspired by thermodynamical dissipative phenomena, we consider bulk viscosity for dark fluid in a spatially flat two-component Universe. Our viscous dark energy model represents phantom-crossing which avoids big-rip singularity. We propose a non-minimal derivative coupling scalar field with zero potential leading to accelerated expansion of the Un…
The molecular gas mass of M 33
Boquien, M.; Braine, J.; Calzetti, D. +15 more
Do some environments favor efficient conversion of molecular gas into stars? To answer this, we need to be able to estimate the H2 mass. Traditionally, this is done using CO observations and a few assumptions but the Herschel observations which cover the far-IR dust spectrum make it possible to estimate the molecular gas mass independen…
On the Statistical Properties of the Lower Main Sequence
Basu, Sarbani; Hekker, Saskia; Bellinger, Earl P. +1 more
Astronomy is in an era where all-sky surveys are mapping the Galaxy. The plethora of photometric, spectroscopic, asteroseismic, and astrometric data allows us to characterize the comprising stars in detail. Here we quantify to what extent precise stellar observations reveal information about the properties of a star, including properties that are …