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An Extreme-precision Radial-velocity Pipeline: First Radial Velocities from EXPRES
Ong, J. M. Joel; Fischer, Debra A.; Buchhave, Lars A. +13 more
The EXtreme-PREcision Spectrograph (EXPRES) is an environmentally stabilized, fiber-fed, R = 137,500, optical spectrograph. It was recently commissioned at the 4.3 m Lowell Discovery Telescope near Flagstaff, Arizona. The spectrograph was designed with a target radial-velocity (RV) precision of 30 cm s-1. In addition to instrumental inn…
Two Views of the Radius Gap and the Role of Light Curve Fitting
Petigura, Erik A.
Recently, several groups have resolved a gap that bifurcates planets between the size of Earth and Neptune into two populations. The location and depth of this feature is an important signature of the physical processes that form and sculpt planets. In particular, planets residing in the radius gap are valuable probes of these processes as they ma…
An extremely energetic supernova from a very massive star in a dense medium
Bieryla, Allyson; Laher, Russ R.; Masci, Frank J. +14 more
The interaction of a supernova with a circumstellar medium (CSM) can dramatically increase the emitted luminosity by converting kinetic energy to thermal energy. In `superluminous' supernovae of type IIn—named for narrow hydrogen lines1 in their spectra—the integrated emission can reach2-6 ~1051 erg, attainable by …
The LX-Luv-Lradio relation and corona-disc-jet connection in optically selected radio-loud quasars
Brandt, W. N.; Xue, Y. Q.; Luo, B. +3 more
Radio-loud quasars (RLQs) are more X-ray luminous than predicted by the X-ray-optical/UV relation (i.e. $L_\mathrm{x}\propto L_\mathrm{uv}^\gamma$) for radio-quiet quasars (RQQs). The excess X-ray emission depends on the radio-loudness parameter (R) and radio spectral slope (αr). We construct a uniform sample of 729 optically selected R…
Alone but not lonely: Observational evidence that binary interaction is always required to form hot subdwarf stars
Pelisoli, Ingrid; Baran, Andrzej S.; Schaffenroth, Veronika +2 more
Context. Hot subdwarfs are core-helium burning stars that show lower masses and higher temperatures than canonical horizontal branch stars. They are believed to be formed when a red giant suffers an extreme mass-loss episode. Binary interaction is suggested to be the main formation channel, but the high fraction of apparently single hot subdwarfs …
A PSF-based Approach to TESS High quality data Of Stellar clusters (PATHOS) - II. Search for exoplanets in open clusters of the Southern ecliptic hemisphere and their frequency
Deleuil, M.; Bedin, L. R.; Montalto, M. +7 more
The scope of the project 'A PSF-based Approach to TESS High Quality data Of Stellar clusters' (PATHOS) is the extraction and analysis of high-precision light curves of stars in stellar clusters and young associations for the identification of candidate exoplanets and variable stars. The cutting-edge tools used in this project allow us to measure t…
SN 2018zd: an unusual stellar explosion as part of the diverse Type II Supernova landscape
Filippenko, Alexei V.; Kriskovics, L.; Pál, A. +29 more
We present extensive observations of SN 2018zd covering the first ∼450 d after the explosion. This SN shows a possible shock-breakout signal ∼3.6 h after the explosion in the unfiltered light curve, and prominent flash-ionization spectral features within the first week. The unusual photospheric temperature rise (rapidly from ∼12 000 to above 18 00…
Mass constraints for 15 protoplanetary discs from HD 1-0
Fedele, D.; Miotello, A.; van Dishoeck, E. F. +6 more
Context. Hydrogen deuteride (HD) rotational line emission can provide reliable protoplanetary disc gas mass measurements, but this molecule is difficult to observe and detections have been limited to three T Tauri discs. No new data have been available since the Herschel Space Observatory mission ended in 2013.
Aims: We set out to obtain new …
Bipolar planetary nebulae from outflow collimation by common envelope evolution
Frank, Adam; Balick, Bruce; De Marco, Orsola +8 more
The morphology of bipolar planetary nebulae (PNe) can be attributed to interactions between a fast wind from the central engine and the dense toroidal-shaped ejecta left over from common envelope (CE) evolution. Here we use the 3D hydrodynamic adaptive mesh refinement (AMR) code ASTROBEAR to study the possibility that bipolar PN outflows can emerg…
The GAPS Programme at TNG. XXI. A GIARPS case study of known young planetary candidates: confirmation of HD 285507 b and refutation of AD Leonis b
Mallonn, M.; Fantinel, D.; Scandariato, G. +67 more
Context. The existence of hot Jupiters is still not well understood. Two main channels are thought to be responsible for their current location: a smooth planet migration through the protoplanetary disk or the circularization of an initial highly eccentric orbit by tidal dissipation leading to a strong decrease in the semimajor axis. Different for…