Search Publications
Missions
Journals
Publication Years
A New Identity Card for the Bulge Globular Cluster NGC 6440 from Resolved Star Counts
Vesperini, Enrico; Pallanca, Cristina; Dalessandro, Emanuele +6 more
We present a new identity card for the cluster NGC 6440 in the Galactic Bulge. We have used a combination of high-resolution Hubble Space Telescope images, wide-field ground-based observations performed with the ESO-FORS2, and the public survey catalog Pan-STARRS to determine the gravitational center, projected density profile, and structural para…
Solar prominence diagnostics from non-LTE modelling of Mg II h&k line profiles
Barczynski, K.; Schmieder, B.; Labrosse, N. +1 more
Aims: We investigate a new method to for obtaining the plasma parameters of solar prominences observed in the Mg II h&k spectral lines by comparing line profiles from the IRIS satellite to a bank of profiles computed with a one-dimensional non-local thermodynamic equilibrium (non-LTE) radiative transfer code.
Methods: Using a grid of…
Ultra-short-period Planets in K2. III. Neighbors are Common with 13 New Multiplanet Systems and 10 Newly Validated Planets in Campaigns 0-8 and 10
Cochran, William D.; Endl, Michael; Howell, Steve B. +14 more
Using the EVEREST photometry pipeline, we have identified 74 candidate ultra-short-period planets (USPs; orbital period P < 1 day) in the first half of the K2 data (Campaigns 0-8 and 10). Of these, 33 candidates have not previously been reported. A systematic search for additional transiting planets found 13 new multiplanet systems containing a…
The surface brightness-colour relations based on eclipsing binary stars and calibrated with Gaia EDR3
Kervella, P.; Anderson, R. I.; Maxted, P. F. L. +23 more
Aims: The surface brightness-colour relation (SBCR) is a basic tool for establishing precise and accurate distances within the Local Group. Detached eclipsing binary stars with accurately determined radii and trigonometric parallaxes allow calibration of the SBCRs with unprecedented accuracy.
Methods: We analysed four nearby eclipsing bi…
The Stars Kepler Missed: Investigating the Kepler Target Selection Function Using Gaia DR2
Huber, Daniel; Berger, Travis A.; Wolniewicz, Linnea M.
The Kepler Mission revolutionized exoplanet science and stellar astrophysics by obtaining highly precise photometry of over 200,000 stars over 4 yr. A critical piece of information to exploit Kepler data is its selection function, since all targets had to be selected from a sample of half a million stars on the Kepler CCDs using limited informatio…
First Phase Space Portrait of a Hierarchical Stellar Structure in the Milky Way
Dalessandro, Emanuele; Saracino, S.; Bellazzini, M. +10 more
We present the first detailed observational picture of a possible ongoing massive cluster hierarchical assembly in the Galactic disk as revealed by the analysis of the stellar full phase space (3D positions and kinematics and spectro-photometric properties) of an extended area (6° diameter) surrounding the well-known h and χ Persei double stellar …
First near-relativistic solar electron events observed by EPD onboard Solar Orbiter
Fedorov, A.; Kulkarni, S. R.; Lario, D. +61 more
Context. Solar Orbiter, launched in February 2020, started its cruise phase in June 2020, in coincidence with its first perihelion at 0.51 au from the Sun. The in situ instruments onboard, including the Energetic Particle Detector (EPD), operate continuously during the cruise phase enabling the observation of solar energetic particles.
Aims: …
GW190814 follow-up with the optical telescope MeerLICHT
Vreeswijk, P. M.; Groot, P. J.; Bloemen, S. +8 more
Context. The Advanced LIGO and Virgo gravitational wave observatories detected a signal on 2019 August 14 during their third observing run, named GW190814. A large number of electromagnetic facilities conducted follow-up campaigns in the search for a possible counterpart to the gravitational wave event, which was made especially promising given th…
The M-dwarf Ultraviolet Spectroscopic Sample. I. Determining Stellar Parameters for Field Stars
France, Kevin; Youngblood, Allison; Pineda, J. Sebastian
Accurate stellar properties are essential for precise stellar astrophysics and exoplanetary science. In the M-dwarf regime, much effort has gone into defining empirical relations that can use readily accessible observables to assess physical stellar properties. Often, these relations for the quantity of interest are cast as a nonlinear function of…
Inspecting the Cepheid parallax of pulsation using Gaia EDR3 parallaxes. Projection factor and period-luminosity and period-radius relations
Kervella, P.; Trahin, B.; Mérand, A. +5 more
Context. As primary anchors of the distance scale, Cepheid stars play a crucial role in our understanding of the distance scale of the Universe because of their period-luminosity relation. Determining precise and consistent parameters (radius, temperature, color excess, and projection factor) of Cepheid pulsating stars is therefore very important.…