Search Publications
The Hyperluminous, Dust-obscured Quasar W2246-0526 at z = 4.6: Detection of Parsec-scale Radio Activity
Knudsen, Kirsten K.; Yang, Jun; An, Tao +4 more
WISE J224607.56-052634.9 (W2246-0526) is a hyperluminous (Lbol ≈ 1.7 × 1014 L⊙), dust-obscured, and radio-quiet quasar at redshift z = 4.6. It plays a key role in probing the transition stage between dusty starbursts and unobscured quasars in the coevolution of galaxies and supermassive black holes (SMBHs). To sear…
Kinematical Signs of Dust Trapping and Feedback in a Local Pressure Bump in the Protoplanetary Disk around HD 142527 Revealed with ALMA
Yen, Hsi-Wei; Gu, Pin-Gao
We analyzed the archival data of the continuum emission at six wavelengths from 3 to 0.4 mm and 13CO and C18O (1-0, 2-1, and 3-2) lines in the protoplanetary disk around HD 142527 obtained with the Atacama Large Millimeter/submillimeter Array. We performed fitting to the spectral energy distributions obtained at the six wavel…
Discovery of a Low-mass Companion Embedded in the Disk of the Young Massive Star MWC 297 with VLT/SPHERE
Manara, Carlo F.; Lodato, Giuseppe; Christiaens, Valentin +4 more
We report the discovery of a low-mass stellar companion around the young Herbig Be star MWC 297. We performed multi-epoch high-contrast imaging in the near-infrared with the Very Large Telescope (VLT)/Spectro-Polarimetric High-contrast Exoplanet REsearch (SPHERE) instrument. The companion is found at a projected separation of 244.7 ± 13.2 au and a…
Evidence of spectral evolution on the white dwarf sample from the Gaia mission
Kepler, S. O.; Koester, D.; Ourique, G. +2 more
Since the Gaia data release 2, several works have been published describing a bifurcation in the observed white dwarf colour-magnitude diagram for ${G_{\mathrm{BP}}}{}-{G_{\mathrm{RP}}}{} \gt 0$ . Some possible explanations in the literature include the existence of a double population with different initial mass functions or two distinct populati…
Candidate LBV stars in galaxy NGC 7793 found via HST photometry + MUSE spectroscopy
Della Bruna, Lorenza; Gouliermis, Dimitrios A.; Van Dyk, Schuyler D. +21 more
Only about 19 Galactic and 25 extragalactic bonafide luminous blue variables (LBVs) are known to date. This incomplete census prevents our understanding of this crucial phase of massive star evolution which leads to the formation of heavy binary black holes via the classical channel. With large samples of LBVs one could better determine the durati…
Lunar ilmenite content as assessed by improved Chandrayaan-1 M3 data
Videen, Gorden; Shkuratov, Yuriy; Surkov, Yehor +2 more
We map ilmenite abundance on the Moon surface using Chandrayaan-1 M3 data, exploiting the strength of the ilmenite absorption band near 1550 nm. The mapping is carried out for an area comprising the border between Mare Serenitatis and Mare Tranquillitatis. We use an improved filtration of the strip noise that is characteristic of Chandr…
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…