Now showing items 1-13 of 13

    • The 2014-2017 outburst of the young star ASASSN-13db. A time-resolved picture of a very-low-mass star between EXors and FUors 

      Sicilia-Aguilar, A.; Oprandi, A.; Froebrich, D.; Fang, M.; Prieto, J. L.; Stanek, K.; Scholz, A.; Kochanek, C. S.; Henning, Th.; Gredel, R.; Holoien, T. W.-S.; Rabus, M.; Shappee, B. J.; Billington, S. J.; Campbell-White, J.; Zegmott, T. J. (2017-11) - Journal article
      Context. ASASSN-13db is a M5-type star with a protoplanetary disk, the lowest mass star known to experience accretion outbursts. Since its discovery in 2013, it has experienced two outbursts, the second of which started ...
    • Accretion discs as regulators of stellar angular momentum evolution in the ONC and Taurus-Auriga 

      Davies, Claire; Gregory, Scott; Greaves, Jane Sophia (2014-10-21) - Journal article
      In light of recent substantial updates to spectral type estimations and newly established intrinsic colours, effective temperatures, and bolometric corrections for pre-main sequence (PMS) stars, we re-address the theory ...
    • The accretion dynamics of EX Lupi in quiescence : the star, the spot, and the accretion column 

      Sicilia-Aguilar, Aurora; Fang, Min; Roccatagliata, Veronica; Collier Cameron, Andrew; Kóspál, Ágnes; Henning, Thomas; Ábrahám, Peter; Sipos, Nikoletta (2015-08-06) - Journal article
      Context. EX Lupi is a young, accreting M0 star and the prototype of EXor variable stars. Its spectrum is very rich in emission lines, including many metallic lines with narrow and broad components. The presence of a close ...
    • CSI 2264 : Simultaneous optical and infrared light curves of young disk-bearing stars in NGC 2264 with CoRoT and Spitzer - Evidence for multiple origins of variability 

      Cody, A.M.; Stauffer, J.; Baglin, A.; Micela, G.; Rebull, L.M.; Flaccomio, E.; Morales-Calderón, M.; Aigrain, S.; Bouvier, J.; Hillenbrand, L.A.; Gutermuth, R.; Song, I.; Turner, N.; Alencar, S.H.P.; Zwintz, K.; Plavchan, P.; Carpenter, J.; Findeisen, K.; Carey, S.; Terebey, S.; Hartmann, L.; Calvet, N.; Teixeira, P.; Vrba, F.J.; Wolk, S.; Covey, K.; Poppenhaeger, K.; Günther, H.M.; Forbrich, J.; Whitney, B.; Affer, L.; Herbst, W.; Hora, J.; Barrado, D.; Holtzman, J.; Marchis, F.; Wood, K.; Guimarães, M.M.; Lillo Box, J.; Gillen, E.; McQuillan, A.; Espaillat, C.; Allen, L.; D'Alessio, P.; Favata, F. (2014-04-01) - Journal article
      We present the Coordinated Synoptic Investigation of NGC 2264, a continuous 30 day multi-wavelength photometric monitoring campaign on more than 1000 young cluster members using 16 telescopes. The unprecedented combination ...
    • The disappearing act: a dusty wind eclipsing RW Aur 

      Bozhinova, I.; Scholz, A.; Costigan, G.; Lux, O.; Davis, C. J.; Ray, T.; Boardman, N. F.; Hay, K. L.; Hewlett, T.; Hodosán, G.; Morton, B. (2016-12-21) - Journal article
      RW Aur is a young binary star that experienced a deep dimming in 2010-11in component A and a second even deeper dimming from summer 2014 to summer 2016. We present new unresolved multi-band photometry during the 2014-16 ...
    • A gas density drop in the inner 6 AU of the transition disk around the Herbig Ae star HD 139614 : Further evidence for a giant planet inside the disk? 

      Carmona, A.; Thi, W. F.; Kamp, I.; Baruteau, C.; Matter, A.; van den Ancker, M.; Pinte, C.; Kóspál, A.; Audard, M.; Liebhart, A.; Sicilia-Aguilar, A.; Pinilla, P.; Regály, Zs.; Güdel, M.; Henning, Th.; Cieza, L. A.; Baldovin-Saavedra, C.; Meeus, G.; Eiroa, C. (2017-02) - Journal article
      Context. Quantifying the gas surface density inside the dust cavities and gaps of transition disks is important to establish their origin. Aims. We seek to constrain the surface density of warm gas in the inner disk of HD ...
    • How do stars gain their mass? A JCMT/SCUBA-2 transient survey of protostars in nearby star-forming regions 

      Herczeg, Gregory J.; Johnstone, Doug; Mairs, Steve; Hatchell, Jennifer; Lee, Jeong-Eun; Bower, Geoffrey C.; Chen, Huei-Ru Vivien; Aikawa, Yuri; Yoo, Hyunju; Kang, Sung-Ju; Kang, Miju; Chen, Wen-Ping; Williams, Jonathan P.; Bae, Jaehan; Dunham, Michael M.; Vorobiov, Eduard I.; Zhu, Zhaohuan; Rao, Ramprasad; Kirk, Helen; Takahashi, Satoko; Morata, Oscar; Lacaille, Kevin; Lane, James; Pon, Andy; Scholz, Aleks; Samal, Manash R.; Bell, Graham S.; Graves, Sarah; Lee, E'lisa M.; Parsons, Harriet; He, Yuxin; Zhou, Jianjun; Kim, Mi-Ryang; Chapman, Scott; Drabek-Maunder, Emily; Chung, Eun Jung; Eyres, Stewart P. S.; Forbrich, Jan; Hillenbrand, Lynne A.; Inutsuka, Shu-ichiro; Kim, Gwanjeong; Kim, Kyoung Hee; Kuan, Yi-Jehng; Kwon, Woojin; Lai, Shih-Ping; Lalchand, Bhavana; Lee, Chang Won; Lee, Chin-Fei; Long, Feng; Lyo, A-Ran; Qian, Lei; Scicluna, Peter; Soam, Archana; Stamatellos, Dimitris; Takakuwa, Shigehisa; Tang, Ya-Wen; Wang, Hongchi; Wang, Yiren (2017-10-27) - Journal article
      Most protostars have luminosities that are fainter than expected from steady accretion over the protostellar lifetime. The solution to this problem may lie in episodic mass accretion—prolonged periods of very low accretion ...
    • More rapidly rotating PMS M dwarfs with light curves suggestive of orbiting clouds of material 

      Stauffer, John; Rebull, Luisa; David, Trevor; Jardine, Moira; Collier Cameron, Andrew; Cody, Ann Marie; Hillenbrand, Lynne; Barrado, David; van Eyken, Julian; Melis, Carl; Briceno, Cesar (2018-02) - Journal article
      In a previous paper, using data from K2 Campaign 2, we identified 11very low mass members of the ρ Oph and Upper Scorpius star-forming region as having periodic photometric variability and phased light curves showing ...
    • Multi-epoch monitoring of the AA Tauri-like star V354 Mon. Indications for a low gas-to-dust ratio in the inner disk warp 

      Schneider, P. C.; Manara, C. F.; Facchini, S.; Guenther, H. M.; Herczeg, G. J.; Fedele, D.; Teixeira, P. S. (2018-06-28) - Journal article
      Disk warps around classical T Tauri stars (CTTSs) can periodically obscure the central star for some viewing geometries. For these so-called AA Tau-like variables, the obscuring material is located in the inner disk and ...
    • The PDS 110 observing campaign - photometric and spectroscopic observations reveal eclipses are aperiodic 

      Osborn, H. P.; Kenworthy, M.; Rodriguez, J. E.; de Mooij, E. J. W.; Kennedy, G. M.; Relles, H.; Gomez, E.; Hippke, M.; Banfi, M.; Barbieri, L.; Becker, I. S.; Benni, P.; Berlind, P.; Bieryla, A.; Bonnoli, G.; Boussier, H.; Brincat, S. M.; Briol, J.; Burleigh, M. R.; Butterley, T.; Calkins, M. L.; Chote, P.; Ciceri, S.; Deldem, M.; Dhillon, V. S.; Dose, E.; Dubois, F.; Dvorak, S.; Esquerdo, G. A.; Evans, D. F.; Ferratfiat, S.; Fossey, S. J.; Günther, M. N.; Hall, J.; Hambsch, F.-J.; Herrero, E.; Hills, K.; James, R.; Jayawardhana, R.; Kafka, S.; Killestein, T. L.; Kotnik, C.; Latham, D. W.; Lemay, D.; Lewin, P.; Littlefair, S.; Lopresti, C.; Mallonn, M.; Mancini, L.; Marchini, A.; McCormac, J. J.; Murawski, G.; Myers, G.; Papini, R.; Popov, V.; Quadri, U.; Quinn, S. N.; Raynard, L.; Rizzuti, L.; Robertson, J.; Salvaggio, F.; Scholz, A.; Sfair, R.; Smith, A. M. S.; Southworth, J.; Tan, T. G.; Vanaverbeke, S.; Waagen, E. O.; Watson, C. A.; West, R. G.; Winter, O. C.; Wheatley, P. J.; Wilson, R. W.; Zhou, G. (2019-05-11) - Journal article
      PDS 110 is a young disk-hosting star in the Orion OB1A association. Two dimming events of similar depth and duration were seen in 2008 (WASP) and 2011 (KELT), consistent with an object in a closed periodic orbit. In this ...
    • Signatures of warm carbon monoxide in protoplanetary discs observed with Herschel SPIRE 

      van der Wiel, M. H. D.; Naylor, D. A.; Kamp, I.; Ménard, F.; Thi, W.-F.; Woitke, Peter; Olofsson, G.; Pontoppidan, K. M.; Di Francesco, J.; Glauser, A. M.; Greaves, Jane Sophia; Ivison, R. J. (2014-11-11) - Journal article
      Molecular gas constitutes the dominant mass component of protoplanetary discs. To date, these sources have not been studied comprehensively at the longest far-infrared and shortest submillimetre wavelengths. This paper ...
    • A spectroscopic survey of Herbig Ae/Be stars with X-shooter - I. Stellar parameters and accretion rates 

      Fairlamb, J. R.; Oudmaijer, R. D.; Mendigutía, I.; Ilee, John David; van den Ancker, M. E. (2015-10-11) - Journal article
      Herbig Ae/Be stars (HAeBes) span a key mass range that links low- and high-mass stars, and thus provide an ideal window from which to explore their formation. This paper presents Very Large Telescope/X-shooter spectra of ...
    • Variability in the CO ro-vibrational lines from HD163296 

      Bertelsen, Rosina P. Hein; Kamp, I.; Plas, G. van der; van den Ancker, M. E.; Waters, L. B. F. M.; Thi, W. -F.; Woitke, Peter (2016-05-11) - Journal article
      We present for the first time a direct comparison of multi-epoch (2001–2002 and 2012) CO ro-vibrational emission lines from HD 163296. We find that both the line shapes and the FWHM (full width at half-maximum) differ ...