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Geodesy, Geophysics and Fundamental Physics Investigations of the BepiColombo Mission
Cappuccio, Paolo; di Stefano, Ivan; Iess, Luciano +15 more
In preparation for the ESA/JAXA BepiColombo mission to Mercury, thematic working groups had been established for coordinating the activities within the BepiColombo Science Working Team in specific fields. Here we describe the scientific goals of the Geodesy and Geophysics Working Group (GGWG) that aims at addressing fundamental questions regarding…
Ionized emission and absorption in a large sample of ultraluminous X-ray sources
Valtchanov, I.; Guainazzi, M.; Fabian, A. C. +6 more
Most ultraluminous X-ray sources (ULXs) are thought to be powered by super-Eddington accretion on to stellar-mass compact objects. Accretors in this extreme regime are naturally expected to ionize copious amounts of plasma in their vicinity and launch powerful radiation-driven outflows from their discs. High spectral resolution X-ray observations …
Diffuse galaxy cluster emission at 168 MHz within the Murchison Widefield Array Epoch of Reionization 0-h field
Pratt, G. W.; Johnston-Hollitt, M.; Offringa, A. R. +3 more
We detect and characterise extended, diffuse radio emission from galaxy clusters at 168 MHz within the Epoch of Reionization 0-h field: a$45^{\circ} \times 45^{\circ}$region of the southern sky centred on R. A.${}= 0^{\circ}$, decl.${}=-27^{\circ}$. We detect 29 sources of interest; a newly detected halo in Abell 0141; a newly detected relic in Ab…
The XMM-SERVS Survey: XMM-Newton Point-source Catalogs for the W-CDF-S and ELAIS-S1 Fields
Yang, Guang; Trump, Jonathan R.; Brandt, W. N. +30 more
We present the X-ray point-source catalogs in two of the XMM-Spitzer Extragalactic Representative Volume Survey (XMM-SERVS) fields, W-CDF-S (4.6 deg2) and ELAIS-S1 (3.2 deg2), aiming to fill the gap between deep pencil-beam X-ray surveys and shallow X-ray surveys over large areas. The W-CDF-S and ELAIS-S1 regions were targete…
Transmission Spectroscopy for the Warm Sub-Neptune HD 3167c: Evidence for Molecular Absorption and a Possible High-metallicity Atmosphere
Gorjian, Varoujan; Fortney, Jonathan J.; Mikal-Evans, Thomas +26 more
We present a transmission spectrum for the warm (500-600 K) sub-Neptune HD 3167c obtained using the Hubble Space Telescope Wide Field Camera 3 infrared spectrograph. We combine these data, which span the 1.125-1.643 µm wavelength range, with broadband transit measurements made using Kepler/K2 (0.6-0.9 µm) and Spitzer/IRAC (4-5 µm…
Massive Compact Disks around FU Orionis-type Young Eruptive Stars Revealed by ALMA
Kudo, T.; Liu, H. B.; Ábrahám, P. +14 more
The FU Orionis-type objects (FUors) are low-mass pre-main-sequence stars undergoing a temporary but significant increase of mass accretion rate from the circumstellar disk onto the protostar. It is not yet clear what triggers the accretion bursts and whether the disks of FUors are in any way different from the disks of nonbursting young stellar ob…
Multi-instrumental view of magnetic fields and activity of ɛ Eridani with SPIRou, NARVAL, and TESS
Donati, J. -F.; Petit, P.; Vidotto, A. A. +6 more
Aims: We report on observations of the active K2 dwarf ɛ Eridani based on contemporaneous SPIRou, NARVAL and TESS data obtained over two months in late 2018, when the activity of the star was reported to be in a non-cyclic phase.
Methods: Near-infrared (NIR) spectropolarimetry was obtained using SPIRou over four nights in late September,…
On the Correlation between Hot Jupiters and Stellar Clustering: High-eccentricity Migration Induced by Stellar Flybys
Rodet, Laetitia; Lai, Dong; Su, Yubo
A recent observational study suggests that the occurrence of hot Jupiters (HJs) around solar-type stars is correlated with stellar clustering. We study a new scenario for HJ formation, called "Flyby Induced High-e Migration," that may help explain this correlation. In this scenario, stellar flybys excite the eccentricity and inclination of an oute…
The Pristine survey XIII: uncovering the very metal-poor tail of the thin disc
Sestito, Federico; Navarro, Julio F.; Malhan, Khyati +9 more
We evaluate the rotational velocity of stars observed by the Pristine survey towards the Galactic anticentre spanning a wide range of metallicities from the extremely metal-poor regime ([Fe/H] < -3) to nearly solar metallicity. In the Galactic anticentre direction, the rotational velocity (Vϕ) is similar to the tangential velocity in…
Quantifying Non-parametric Structure of High-redshift Galaxies with Deep Learning
Bamford, S. P.; Conselice, C. J.; Ferrari, F. +2 more
At high redshift, due to both observational limitations and the variety of galaxy morphologies in the early universe, measuring galaxy structure can be challenging. Non-parametric measurements such as the CAS system have thus become an important tool due to both their model-independent nature and their utility as a straightforward computational pr…