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Searching for Hα-emitting sources in the gaps of five transitional disks. SPHERE/ZIMPOL high-contrast imaging
de Gregorio-Monsalvo, I.; Quanz, S. P.; Montesinos, B. +13 more
Context. (Pre-)Transitional disks show gaps and cavities that can be related to ongoing planet formation. According to theory, young embedded planets can accrete material from the circumplanetary and circumstellar disks and can be detected using accretion tracers, such as the Hα emission line.
Aims: We aim to detect accreting proto…
The HD 137496 system: A dense, hot super-Mercury and a cold Jupiter
Bossini, D.; Adibekyan, V.; Hoyer, S. +28 more
Context. Most of the currently known planets are small worlds with radii between that of the Earth and that of Neptune. The characterization of planets in this regime shows a large diversity in compositions and system architectures, with distributions hinting at a multitude of formation and evolution scenarios. However, many planetary populations,…
Planet Hunters TESS IV: a massive, compact hierarchical triple star system TIC 470710327
Aigrain, S.; Lee, S.; Escorza, A. +37 more
We report the discovery and analysis of a massive, compact, hierarchical triple system (TIC 470710327) initially identified by citizen scientists in data obtained by NASA's Transiting Exoplanet Survey Satellite (TESS). Spectroscopic follow-up observations obtained with the HERMES spectrograph, combined with eclipse-timing variations (ETVs), confir…
The Pristine survey - XV. A CFHT ESPaDOnS view on the Milky Way halo and disc populations
Jablonka, P.; Lardo, C.; Kordopatis, G. +14 more
We present a one-dimensional, local thermodynamic equilibrium homogeneous analysis of 132 stars observed at high resolution with ESPaDOnS. This represents the largest sample observed at high resolution (R ~ 40 000) from the Pristine survey. This sample is based on the first version of the Pristine catalogue and covers the full range of metalliciti…
Cross-checking SMBH mass estimates in NGC 6958 - I. Stellar dynamics from adaptive optics-assisted MUSE observations
Weilbacher, Peter M.; Krajnović, Davor; van de Ven, Glenn +9 more
Supermassive black hole masses (MBH) can dynamically be estimated with various methods and using different kinematic tracers. Different methods have only been cross-checked for a small number of galaxies and often show discrepancies. To understand these discrepancies, detailed cross-comparisons of additional galaxies are needed. We pres…
Magnetic helicity and energy of emerging solar active regions and their erruptivity
Liu, Y.; Nindos, A.; Liokati, E.
Aims: We investigate the role of the accumulation of magnetic helicity and magnetic energy in the generation of coronal mass ejections (CMEs) from emerging solar active regions (ARs).
Methods: Using vector magnetic field data obtained by the Helioseismic and Magnetic Imager on board the Solar Dynamics Observatory, we calculated the magne…
The TREX Survey: Kinematical Complexity Throughout M33's Stellar Disk and Evidence for a Stellar Halo
Williams, Benjamin F.; Gilbert, Karoline M.; Wojno, Jennifer +9 more
We present initial results from a large spectroscopic survey of stars throughout M33's stellar disk. We analyze a sample of 1667 red giant branch (RGB) stars extending to projected distances of ~11 kpc from M33's center (~18 kpc, or ~10 scale lengths, in the plane of the disk). The line-of-sight velocities of RGB stars show the presence of two kin…
Absolute Calibration of Cepheid Period-Luminosity Relations in NGC 4258
Casertano, Stefano; Filippenko, Alexei V.; Riess, Adam G. +6 more
Owing to its accurate distance measured from water-maser motions, NGC 4258 is one of the most important anchors for calibrating the Cepheid period-luminosity relations (PLRs). We expand on previous efforts and carry out a new Cepheid search in this system using the Hubble Space Telescope. We discover and measure a sample of 669 Cepheids in four ne…
Acceleration and cooling of the corona during X-ray flares from the Seyfert galaxy I Zw 1
Brandt, W. N.; Costantini, E.; Blandford, R. D. +2 more
We report on X-ray flares that were observed from the active galactic nucleus I Zwicky 1 (I Zw 1) in 2020 January by the NuSTAR and XMM-Newton observatories. The X-ray spectrum is well-described by a model comprised of the continuum emission from the corona and its reflection from the accretion disc around a rapidly spinning (a > 0.94) black ho…
Completeness of the Gaia verse - V. Astrometry and radial velocity sample selection functions in Gaia EDR3
Everall, Andrew; Boubert, Douglas
We risk reaching false scientific conclusions if we test our physical theories against subsets of the Gaia catalogue without correcting for the biased process by which stars make it into our sample. In this paper, we produce selection functions for three Gaia science samples to enable the community to correct for this bias. We estimate the probabi…