Search Publications
NEOWISE Variability of the New Gaia Herbig Ae/Be and Classical Be Stars-Variability Sample and Statistical Analysis
Mei, Ying; Song, Shi-Ming; Liu, Jun-Ting +2 more
Light variability is an essential attribute of young stellar objects (YSOs) at the pre-main-sequence (PMS) stage, which can be treated as an indicator to trace star formation. We present a statistical study on the infrared NEOWISE variability of new and large-sized PMS stars as well as Herbig Ae/Be (HAeBe) and classical Be (CBe) stars identified f…
Stereoscopic disambiguation of vector magnetograms: First applications to SO/PHI-HRT data
Woch, J.; Solanki, S. K.; Parenti, S. +34 more
Contact. Spectropolarimetric reconstructions of the photospheric vector magnetic field are intrinsically limited by the 180° ambiguity in the orientation of the transverse component. So far, the removal of such an ambiguity has required assumptions about the properties of the photospheric field, which makes disambiguation methods model-dependent. …
Updated Reference Wavelengths for Si VII and Mg VII Lines in the 272-281 Å Range
Young, Peter R.
New reference wavelengths for atomic transitions of Mg VII and Si VII in the 272-281 Å wavelength range are derived using measurements from the Extreme-ultraviolet Imaging Spectrometer (EIS) on board the Hinode spacecraft. Mg VII and Si VII are important ions for measuring plasma properties in the solar transition region at around 0.6 MK. The six …
Coronal Propagation of Solar Protons during and after Their Stochastic Acceleration
Logachev, Yu. I.; Struminsky, A. B.; Grigorieva, I. Yu. +1 more
Solar protons in eruptive flares are stochastically accelerated in a wide spatial angle, and then they are effectively kept behind the expanding coronal mass ejection (CME) front, which can either bring protons to the magnetic-field line going to a remote observer or carry them away. We consider 13 solar proton events of cycle 24 in which protons …
X-ray non-detection of PSR J0250 + 5854
Esposito, P.; Rigoselli, M.; Stappers, B. W. +1 more
We conducted a deep XMM-Newton observing campaign on the 23.5-s radio pulsar PSR J0250 + 5854 in order to better understand the connection between long-period, radio-emitting neutron stars and their high-energy-emitting counterparts. No X-ray emission was detected resulting in an upper limit in the bolometric luminosity of PSR J0250 + 5854 of <…
A Catalog of Nearby Accelerating Star Candidates in Gaia DR3
Kenyon, Scott J.; Bromley, Benjamin C.; Whiting, Marc L. +1 more
We describe a new catalog of accelerating star candidates with Gaia G ≤ 17.5 mag and distances d ≤ 100 pc. Designated as the Gaia Nearby Accelerating Star Catalog (GNASC), it contains 29,684 members identified using a supervised machine-learning algorithm trained on the Hipparcos-Gaia Catalog of Accelerations (HGCA), Gaia Data Release 2, and Gaia …
Investigating temporal changes in Jupiter's aerosol structure with rotationally-averaged 2015-2020 HST WFC3 images
Sromovsky, Lawrence A.; Fry, Patrick M.
Annual imaging observations of Jupiter from 2015 onward by the Hubble Space Telescope (HST) Wide Field Camera 3 (WFC3) as part of the Outer Planet Atmospheres Legacy (OPAL) program (Simon et al., 2015) have provided a valuable data set from which Jupiter's temporal variability can be characterized and modeled. Spectral samples at discrete filter b…
The MUSE-Faint survey. IV. Dissecting Leo T, a gas-rich relic with recent star formation
Boogaard, Leindert A.; Brinchmann, Jarle; Weilbacher, Peter M. +6 more
Context. Leo T (MV = −8.0) is a peculiar dwarf galaxy that stands out for being both the faintest and the least massive galaxy known to contain neutral gas and to display signs of recent star formation. It is also extremely dark-matter dominated. As a result, Leo T presents an invaluable opportunity to study the processes of gas and sta…
Investigating Possible Binarity for GJ 229B
Mandell, Avi M.; McElwain, Michael W.; Howe, Alex R.
GJ 229B, the first type-T brown dwarf to be discovered, has presented a tension between comparisons with evolutionary models and the larger-than-expected mass and radius values derived from spectroscopic and astrometric observations. We examine the hypothesis that GJ 229B is actually a binary substellar object by using two grid-based fits using ev…
Second-generation protoplanetary discs around evolved binaries: a high-resolution polarimetric view with SPHERE/IRDIS
Ertel, Steve; Van Winckel, Hans; Andrych, Kateryna +3 more
Binary post-asymptotic giant branch (post-AGB) stars are products of a poorly understood binary interaction process that occurs during the AGB phase. These systems comprise a post-AGB primary star, a main-sequence secondary companion and a stable circumbinary disc. Studying the structure and properties of these circumbinary discs is crucial for ga…