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Apsidal motion in the massive binary HD 152248
Gosset, E.; Rauw, G.; Manfroid, J. +3 more
Context. The eccentric massive binary HD 152248 (also known as V1007 Sco), which hosts two O7.5 III-II(f) stars, is the most emblematic eclipsing O-star binary in the very young and rich open cluster NGC 6231. Its properties render the system an interesting target for studying tidally induced apsidal motion.
Aims: Measuring the rate of apsida…
TYC 8327-1678-1: a new super lithium-rich K giant
Pereira, C. B.; Holanda, N.; Drake, N. A.
In this work, we show that TYC 8327-1678-1 is a low-mass red giant star with a super lithium abundance in its atmosphere. For this, we used high-resolution spectroscopy to determine atmospheric parameters, the chemical abundances of the light elements and the isotopic ratio 12C/13C using the spectral synthesis techniques and …
The widest broadband transmission spectrum (0.38-1.71 µm) of HD 189733b from ground-based chromatic Rossiter-McLaughlin observations
López-Puertas, M.; Nagel, E.; Amado, P. J. +22 more
Multiband photometric transit observations (spectro-photometric) have been used mostly so far to retrieve broadband transmission spectra of transiting exoplanets in order to study their atmospheres. An alternative method was proposed, and has only been used once, to recover broadband transmission spectra using chromatic Rossiter-McLaughlin observa…
THOR 42: A touchstone ∼24 Myr-old eclipsing binary spanning the fully convective boundary
Zhou, George; Murphy, Simon J.; Feinstein, Adina D. +7 more
We present the characterization of CRTS J055255.7-004426 (=THOR 42), a young eclipsing binary comprising two pre-main sequence M dwarfs (combined spectral type M3.5). This nearby (103 pc), short-period (0.859 d) system was recently proposed as a member of the ∼24 Myr-old 32 Orionis Moving Group. Using ground- and space-based photometry in combinat…
HD 145263: Spectral Observations of Silica Debris Disk Formation via Extreme Space Weathering?
Sitko, M. L.; Marengo, M.; Chen, C. H. +9 more
We report here time-domain infrared spectroscopy and optical photometry of the HD 145263 silica-rich circumstellar-disk system taken from 2003 through 2014. We find an F4V host star surrounded by a stable, massive 1022-1023 kg (MMoon to MMars) dust disk. No disk gas was detected, and the primary star was…
The Big Sibling of AU Mic: A Cold Dust-rich Debris Disk around CP-72 2713 in the β Pic Moving Group
Pascucci, Ilaria; Pál, András; Hughes, A. Meredith +8 more
Analyzing Spitzer and Herschel archival measurements we identified a debris disk around the young K7/M0 star CP-72 2713. The system belongs to the 24 Myr old β Pic moving group. Our new 1.33 mm continuum observation, obtained with the Atacama Large Millimeter/submillimeter Array 7 m array, revealed an extended dust disk with a peak radius of 140 a…
A Multiwavelength Search for Intrinsic Linear Polarization in Wolf-Rayet Winds
Moffat, Anthony F. J.; Fullard, Andrew G.; Manset, Nadine +3 more
Wolf-Rayet stars have strong, hot winds, with mass-loss rates at least a factor of 10 greater than their O-star progenitors, although their terminal wind speeds are similar. In this paper, we use the technique of multiband linear polarimetry to extract information on the global asymmetry of the wind in a sample of 47 bright Galactic WR stars. Our …
Mutual inclinations between giant planets and their debris discs in HD 113337 and HD 38529
Wyatt, Mark C.; Kennedy, Grant M.; Xuan, Jerry W. +1 more
HD 113337 and HD 38529 host pairs of giant planets, a debris disc, and wide M-type stellar companions. We measure the disc orientation with resolved images from Herschel and constrain the three-dimensional orbits of the outer planets with Gaia DR2 and Hipparcos astrometry. Resolved disc modelling leaves degeneracy in the disc orientation, so we de…
High-speed stars: Galactic hitchhikers
Bonifacio, P.; Caffau, E.; Spite, M. +8 more
Context. The search for stars born in the very early stages of the Milky Way star formation history is of paramount importance in the study of the early Universe since their chemistry carries irreplaceable information on the conditions in which early star formation and galaxy buildup took place. The search for these objects has generally taken the…
A new white dwarf companion around the Δµ star GJ 3346
Sozzetti, A.; D'Orazi, V.; Zurlo, A. +7 more
We present the discovery of a white dwarf companion at ∼3.6 arcsec from GJ 3346, a nearby (π ∼ 42 mas) K star observed with SPHERE@VLT as part of an open time survey for faint companions to objects with significant proper motion discrepancies (Δµ) between Gaia DR1 and Tycho-2. Syrius-like systems like GJ 3346 AB, which include a main-sequenc…