Search Publications
Optical detection of the black widow binary PSR J2052+1219
Zharikov, S.; Deneva, J. S.; Kirichenko, A. +2 more
We present optical time-resolved multiband photometry of the black widow binary millisecond pulsar J2052+1219 using direct-imaging observations with the 2.1-m telescope of the Observatorio Astronomico Nacional San Pedro Mártir (OAN-SPM), Mexico. The observations reveal a variable optical source whose position and periodicity, P = 2.752 h, coincide…
WASP-169, WASP-171, WASP-175, and WASP-182: three hot Jupiters and one bloated sub-Saturn mass planet discovered by WASP-South
Bouchy, F.; Queloz, D.; Ségransan, D. +21 more
We present the discovery of four new giant planets from the Wide Angle Search for Planets-South (WASP-South), three hot Jupiters and one bloated sub-Saturn mass planet: WASP-169b, WASP-171b, WASP-175b, and WASP-182b. Besides the discovery photometry from WASP-South we use radial velocity measurements from CORALIE and HARPS and follow-up photometry…
On the photometric signature of fast rotators
Girardi, Léo; Marigo, Paola; Bellini, Andrea +4 more
Rapidly rotating stars have been recently recognized as having a major role in the interpretation of colour-magnitude diagrams of young and intermediate-age star clusters in the Magellanic Clouds and in the Milky Way. In this work, we evaluate the distinctive spectra and distributions in colour-colour space that follow from the presence of a subst…
Recognition of M-type stars in the unclassified spectra of LAMOST DR5 using a hash-learning method
Luo, A. -L.; Chen, J. -J.; Du, B. +6 more
Our study aims to recognize M-type stars which are classified as `UNKNOWN' due to poor quality in the Large sky Area Multi-Object fiber Spectroscopic Telescope (LAMOST) DR5 V1. A binary nonlinear hashing algorithm based on Multi-Layer Pseudo-Inverse Learning (ML-PIL) is proposed to effectively learn spectral features for M-type-star detection, whi…
Radical-assisted polymerization in interstellar ice analogues: formyl radical and polyoxymethylene
Duvernay, F.; Danger, G.; Chiavassa, T. +5 more
We present new laboratory experiments on the low-temperature formation of complex organic molecules (COMs) such as polyoxymethylene (POM), glycolaldehyde, ethylene glycol, and possibly glyceraldehyde and glycerol through radical-induced reactivity from vacuum ultraviolet (VUV) photolysis of formaldehyde in Ar and Xe matrices. The radical reactivit…
Multidisciplinary analysis of the Hapi region located on Comet 67P/Churyumov-Gerasimenko
Lamy, P. L.; Lara, L. M.; Shi, X. +44 more
By using the Rosetta/OSIRIS-NAC data set taken in 2014 August, we focus on the neck region, called Hapi, located on 67P Churyumov-Gerasimenko's Northern hemisphere. The gravitational potential and slopes of Hapi, coupled with the geological unit identification and the boulder size-frequency distributions, support the interpretation that both talus…
Development of models for nearbaby young stellar moving groups: creation, revision, and finalization of the models
Song, Inseok; Lee, Jinhee
In our previous research, we developed a tool for calculating Bayesian membership probability for nearby young stellar moving groups (BAMG: Bayesian Analysis of Moving Groups). The study presented the importance of careful construction of models in moving group membership assessment, using β Pictoris moving group as a test case. In this study, we …
Fundamental properties of Kepler and CoRoT targets - IV. Masses and radii from frequencies of minimum Δν and their implications
Yıldız, M.; Kayhan, C.; çelik Orhan, Z.
Recently, by analysing the oscillation frequencies of 90 stars, Yıldız, Çelik Orhan & Kayhan have shown that the reference frequencies (νmin0, νmin1, and νmin2) derived from glitches due to He II ionization zone have very strong diagnostic potential for the determination of thei…
Observation of narrow polar jets in the nascent wind of oxygen-rich AGB star EP Aqr
Winters, J. M.; Tuan-Anh, P.; Hoai, D. T. +6 more
Using ALMA observations of 12CO(2-1), 28SiO(5-4), and 32SO2(166,10-175,13) emissions of the circumstellar envelope of AGB star EP Aqr, we describe the morpho-kinematics governing the nascent wind. Main results are as follows: (1) Two narrow polar structures, referred to as jets, lau…
Discovery of s-process enhanced stars in the LAMOST survey
Casey, Andrew R.; Ho, Anna Y. Q.; Ji, Alexander P. +7 more
Here we present the discovery of 895 s-process-rich candidates from 454 180 giant stars observed by the Large Sky Area Multi-Object Fibre Spectroscopic Telescope (LAMOST) using a data-driven approach. This sample constitutes the largest number of s-process enhanced stars ever discovered. Our sample includes 187 s-process-rich candidates that are e…