Search Publications
When the tale comes true: multiple populations and wide binaries in the Orion Nebula Cluster
Manara, Carlo F.; Petr-Gotzens, Monika G.; Boffin, Henri M. J. +5 more
Context. Recently published high-quality OmegaCAM photometry of the 3 × 3 deg around the Orion Nebula Cluster (ONC) in r, and i filters revealed three well-separated pre-main sequences in the color-magnitude diagram (CMD). The objects belonging to the individual sequences are concentrated toward the center of the ONC. The authors concluded that th…
Distributed glycine in comet 67P/Churyumov-Gerasimenko
Lasue, J.; Altwegg, K.; Biver, N. +10 more
Most of the gaseous molecules that are detected in cometary atmospheres are produced through sublimation of nucleus ices. Distributed sources may also occur, that is, production within the coma, from the solid component of dust particles that are ejected from the nucleus. Glycine, the simplest amino acid, was observed episodically in the atmospher…
Substructure and halo population of Double Cluster h and χ Persei
Chen, Li; Zhong, Jing; Li, Lu +3 more
Context. Gaia DR2 provides an ideal dataset to study the stellar populations of open clusters at larger spatial scales because the cluster member stars can be well identified by their location in the multidimensional observational parameter space with high precision parameter measurements.
Aims: In order to study the stellar population and po…
The ALMA Lupus protoplanetary disk survey: evidence for compact gas disks and molecular rings from CN
Testi, L.; Tazzari, M.; Williams, J. P. +10 more
Context. The cyanide radical CN is abundant in protoplanetary disks, with line fluxes often comparable to those of 13CO. It is known to be sensitive to UV irradiation of the upper disk atmosphere, with models predicting ring-shaped emission.
Aims: We seek to characterize the CN emission from 94 Class-II disks in the Lupus star-form…
H-band discovery of additional second-generation stars in the Galactic bulge globular cluster NGC 6522 as observed by APOGEE and Gaia
Schultheis, M.; Minniti, D.; Souto, Diogo +34 more
We present an elemental abundance analysis of high-resolution spectra for five giant stars spatially located within the innermost regions of the bulge globular cluster NGC 6522 and derive Fe, Mg, Al, C, N, O, Si, and Ce abundances based on H-band spectra taken with the multi-object APOGEE-north spectrograph from the SDSS-IV Apache Point Observator…
Characterization and formation of on-disk spicules in the Ca II K and Mg II k spectral lines
Joshi, Jayant; Rouppe van der Voort, Luc; Henriques, Vasco M. J. +1 more
We characterize, for the first time, type-II spicules in Ca II K 3934 Å using the CHROMIS instrument at the Swedish 1 m Solar Telescope. We find that their line formation is dominated by opacity shifts with the K3 minimum best representing the velocity of the spicules. The K2 features are either suppressed by the Doppler-shif…
A Jovian planet in an eccentric 11.5 day orbit around HD 1397 discovered by TESS
Bouchy, F.; Stassun, K.; Winn, J. N. +49 more
The Transiting Exoplanet Survey Satellite TESS has begun a new age of exoplanet discoveries around bright host stars. We present the discovery of HD 1397b (TOI-120.01), a giant planet in an 11.54-day eccentric orbit around a bright (V = 7.9) G-type subgiant. We estimate both host star and planetary parameters consistently using EXOFASTv2 based on …
Chemical and kinematic structure of extremely high-velocity molecular jets in the Serpens Main star-forming region
Hull, Charles L. H.; Le Gouellec, Valentin J. M.; van Dishoeck, Ewine F. +3 more
Context. Outflows are one of the first signposts of ongoing star formation. The fastest molecular component of protostellar outflows, extremely high-velocity (EHV) molecular jets, are still puzzling since they are seen only rarely. As they originate deep inside the embedded protostar-disk system, they provide vital information about the outflow-la…
The SOPHIE search for northern extrasolar planets. XIV. A temperate (Teq 300 K) super-earth around the nearby star Gliese 411
Bouchy, F.; Deleuil, M.; Moutou, C. +33 more
Periodic radial velocity variations in the nearby M-dwarf star Gl 411 are reported, based on measurements with the SOPHIE spectrograph. Current data do not allow us to distinguish between a 12.95-day period and its one-day alias at 1.08 days, but favour the former slightly. The velocity variation has an amplitude of 1.6 m s-1, making th…
Spectral and orbital characterisation of the directly imaged giant planet HIP 65426 b
Queloz, D.; Quanz, S. P.; Avenhaus, H. +38 more
HIP 65426 b is a recently discovered exoplanet imaged during the course of the SPHERE-SHINE survey. Here we present new L' and M' observations of the planet from the NACO instrument at the VLT from the NACO-ISPY survey, as well as a new Y -H spectrum and K-band photometry from SPHERE-SHINE. Using these data, we confirm the nature of the companion …