Search Publications
Estimation of singly transiting K2 planet periods with Gaia parallaxes
Jordán, Andrés; Espinoza, Néstor; Brahm, Rafael +1 more
When a planet is only observed to transit once, direct measurement of its period is impossible. It is possible, however, to constrain the periods of single transiters, and this is desirable as they are likely to represent the cold and far extremes of the planet population observed by any particular survey. Improving the accuracy with which the per…
The Milky Way like galaxy NGC 6384 and its nuclear star cluster at high NIR spatial resolution using LBT/ARGOS commissioning data
Neumayer, Nadine; Georgiev, Iskren Y.; Baumgardt, Holger +11 more
We analyse high spatial resolution near infrared (NIR) imaging of NGC 6384, a Milky Way like galaxy, using ARGOS commissioning data at the Large Binocular Telescope (LBT). ARGOS provides a stable PSFFWHM = 0{^''.}2-0{^''.}3 AO correction of the ground layer across the LUCI 2 NIR camera 4 × 4 arcmin field by using s…
Chandra and Hubble Space Telescope observations of dark gamma-ray bursts and their host galaxies
Lyman, J. D.; Fruchter, A. S.; Perley, D. A. +8 more
We present a study of 21 dark gamma-ray burst (GRB) host galaxies, predominantly using X-ray afterglows obtained with the Chandra X-Ray Observatory (CXO) to precisely locate the burst in deep Hubble Space Telescope (HST) imaging of the burst region. The host galaxies are well-detected in F160W in all but one case and in F606W imaging in 60 per cen…
67P/Churyumov-Gerasimenko active areas before perihelion identified by GIADA and VIRTIS data fusion
Fulle, M.; Erard, S.; Capaccioni, F. +16 more
We characterized 67P/Churyumov-Gerasimenko's cometary activity during its inbound arc before perihelion (2014 August-2015 January). We focused on the geomorphological regions of the Northern hemisphere observed by the ESA/Rosetta space probe during this time period. The GIADA dust detector characterized the physical properties of the fluffy and co…
Constraining the magnetic field on white dwarf surfaces; Zeeman effects and fine structure constant variation
Barstow, M. A.; Holberg, J. B.; Webb, J. K. +12 more
White dwarf (WD) atmospheres are subjected to gravitational potentials around 105 times larger than occur on Earth. They provide a unique environment in which to search for any possible variation in fundamental physics in the presence of strong gravitational fields. However, a sufficiently strong magnetic field will alter absorption lin…
Subaru narrow-band imaging search for Lyman continuum from galaxies at z > 3 in the GOODS-N field
Inoue, Akio K.; Yamada, Toru; Iwata, Ikuru +2 more
We report results of a search for galaxies at z > 3 with Lyman continuum (LyC) emission using a narrow-band filter NB359 with Subaru/Suprime-Cam in an ∼800 arcmin2 blank field around the GOODS-N. We use 103 star-forming galaxies (SFGs) and 8 active galactic nuclei (AGNs) with spectroscopic redshifts in a range between 3.06 and 3.5 an…
Lack of close-in, massive planets of main-sequence A-type stars from Kepler
Skarka, Marek; Grziwa, Sascha; Guenther, Eike W. +5 more
Some theories of planet formation and evolution predict that intermediate-mass stars host more hot Jupiters than Sun-like stars, others reach the conclusion that such objects are very rare. By determining the frequencies of those planets we can test those theories.
Investigating the origin of the Fe emission lines of the Seyfert 1 galaxy Mrk 205
Guainazzi, Matteo; Laha, Sibasish; Tripathi, Shruti +1 more
We have investigated the nature and origin of the Fe K emission lines in Mrk 205 using observations with Suzaku and XMM-Newton, aiming to resolve the ambiguity between a broad emission line and multiple unresolved lines of higher ionization. We detect the presence of a narrow Fe K α emission line along with a broad-band Compton reflection hump at …
The imprint of the thick stellar disc in the mid-plane of three early-type edge-on galaxies in the Fornax cluster
Katkov, Ivan Yu; Kniazev, Alexei Yu; Kasparova, Anastasia V. +1 more
Galactic stellar discs, such as that of the Milky Way, have usually a complex structure consisting of a thin and a thick component. The study of galactic disc sub-structures and their differences can shed light on the galaxy assembling processes and their evolution. However, due to observational difficulties there is a lack of information about th…
A deeper look at the dust attenuation law of star-forming galaxies at high redshift
Bressan, A.; Pérez-González, P. G.; Barro, G. +4 more
A diverse range of dust attenuation laws is found in star-forming galaxies. In particular, Tress et al. (2018) studied the SHARDS survey to constrain the NUV bump strength (B) and the total-to-selective ratio (RV) of 1753 star-forming galaxies in the GOODS-N field at 1.5 < z < 3. We revisit here this sample to assess the implicati…