Observation of light echoes around very young stars

Ortiz, J. L.; Sugerman, Ben; Cueva, I. de la; Santos-Sanz, P.; Duffárd, R.; Gil-Hutton, R.; Melita, M. D.; Morales, N.

doi:10.1051/0004-6361/201014438

Cited by 13 publications

(13 citation statements)

References 43 publications

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“…Since then, LEs have been seen associated with a wide variety of objects: the Galactic Nova Sagittarii 1936 (Swope 1940), the eruptive variable V838 Monocerotis (Bond et al 2003), the Cepheid RS Puppis (Westerlund 1961;Havlen 1972), the T Tauri star S CrA (Ortiz et al 2010), and the Herbig Ae/Be star R CrA (Ortiz et al 2010). Echoes have also been observed from extragalactic SNe, with SN 1987A being the most famous case (Crotts 1988;Suntzeff et al 1988b), but also including SNe 1980K (Sugerman et al 2012), 1991T (Schmidt et al 1994;Sparks et al 1999), 1993J Sugerman & Crotts 2002Liu, Bregman, & Seitzer 2003), 1995E (Quinn et al 2006), 1998bu (Garnavich et al 2001;Cappellaro et al 2001), 2002hh (Welch et al 2007;Otsuka et al 2012), 2003gd (Sugerman 2005; Van Dyk, Li, & Filippenko 2006;Otsuka et al 2012), 2004et (Otsuka et al 2012), 2006X (Wang et al 2008;Crotts & Yourdon 2008), 2006bc (Gallagher et al 2011;Otsuka et al 2012), 2006gy (Miller et al 2010), and 2007it (Andrews et al 2011).…”

Section: Finding Lesmentioning

confidence: 99%

“…The observational material available to Ortiz et al (2010) for the analysis of S CrA consisted of I-band photometry from the All-Sky Automated Survey (ASAS: Pojmanski 1997) spanning approximately 150 days and nine images spanning 93 days. They adopted a model of a spherically symmetric shell of dust centred on the star and then associated the four brightness peaks from the ASAS time series with the observed LE features from their imaging.…”

Section: S Cra and R Cramentioning

confidence: 99%

“…Based on their assumptions, they arrived at a distance to S CrA of 128 AE 16 pc and a distance between the star and dust shell of 10 4 AU. Ortiz et al (2010) speculated that the dust shell could be similar in nature to the Oort cloud surrounding our Sun.…”

Section: S Cra and R Cramentioning

confidence: 99%

“…Distance of 138 AE 16 pc by Ortiz et al (2010). However, analysis contains flaws and it is uncertain if this is correct.…”

Section: Rs Pupmentioning

confidence: 99%

“…In a recent paper, Ortiz et al (2010) presented the results of their imaging of LEs around two young stellar objects, the T Tauri star S CrA and the Herbig Ae/Be star R CrA. These classes of variable stars are known for irregular (non-repeating) variability.…”

Section: S Cra and R Cramentioning

confidence: 99%

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Light Echoes of Transients and Variables in the Local Universe

Rest

Sinnott

Welch

2012

Publ. – Astron. Soc. Aust

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Astronomical light echoes, the time-dependent light scattered by dust in the vicinity of varying objects, have been recognized for over a century. Initially, their utility was thought to be confined to mapping out the three-dimensional distribution of interstellar dust. Recently, the discovery of spectroscopically useful light echoes around centuries-old supernovae in the Milky Way and the Large Magellanic Cloud has opened up new scientific opportunities to exploit light echoes.In this review, we describe the history of light echoes in the local Universe and cover the many new developments in both the observation of light echoes and the interpretation of the light scattered from them. Among other benefits, we highlight our new ability to classify outbursting objects spectroscopically, view them from multiple perspectives, obtain a spectroscopic time series of the outburst, and establish accurate distances to the source event. We also describe the broader range of variable objects with properties that may be better understood from light-echo observations. Finally, we discuss the prospects of new light-echo techniques not yet realized in practice.

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Section: Finding Lesmentioning

confidence: 99%

Section: S Cra and R Cramentioning

confidence: 99%

Section: S Cra and R Cramentioning

confidence: 99%

“…Distance of 138 AE 16 pc by Ortiz et al (2010). However, analysis contains flaws and it is uncertain if this is correct.…”

Section: Rs Pupmentioning

confidence: 99%

Section: S Cra and R Cramentioning

confidence: 99%

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Light Echoes of Transients and Variables in the Local Universe

Rest

Sinnott

Welch

2012

Publ. – Astron. Soc. Aust

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Light Echoes of Historic Transients

Rest¹,

Sinnott

Welch

et al. 2013

Proc. IAU

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Light echoes, light from a variable source scattered off dust, have been observed for over a century. The recent discovery of light echoes around centuries-old supernovae in the Milky Way and the Large Magellanic Cloud have allowed the spectroscopic characterization of these events, even without contemporaneous photometry and spectroscopy using modern instrumentation. Here we review the recent scientific advances using light echoes of ancient and historic transients, and focus on our latest work on SN 1987A's and Eta Carinae's light echoes.Comment: 9 pages, 5 figures, IAU 296 conference proceeding

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Revealing the inner circumstellar disk of the T Tauri star S Coronae Australis N using the VLTI

Vural

Kreplin

Kraus

et al. 2012

A&A

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Aims. We investigate the structure of the circumstellar disk of the T Tauri star S CrA N and test whether the observations agree with the standard picture proposed for Herbig Ae stars. Methods. Our observations were carried out with the VLTI/AMBER instrument in the H and K bands with the low spectral resolution mode. For the interpretation of our near-infrared AMBER and archival mid-infrared MIDI visibilities, we employed both geometric and temperature-gradient models. Results. To characterize the disk size, we first fitted geometric models consisting of a stellar point source, a ring-shaped disk, and a halo structure to the visibilities. In the H and K bands, we measured ring-fit radii of 0.73 ± 0.03 mas (corresponding to 0.095 ± 0.018 AU for a distance of 130 pc) and 0.85 ± 0.07 mas (0.111 ± 0.026 AU), respectively. This K-band radius is approximately two times larger than the dust sublimation radius of ≈0.05 AU expected for a dust sublimation temperature of 1500 K and gray dust opacities, but approximately agrees with the prediction of models including backwarming (namely a radius of ≈0.12 AU). The derived temperature-gradient models suggest that the disk is approximately face-on consisting of two disk components with a gap between star and disk. The inner disk component has a temperature close to the dust sublimation temperature and a quite narrow intensity distribution with a radial extension from 0.11 AU to 0.14 AU. Conclusions. Both our geometric and temperature-gradient models suggest that the T Tauri star S CrA N is surrounded by a circumstellar disk that is truncated at an inner radius of ≈0.11 AU. The narrow extension of the inner temperature-gradient disk component implies that there is a hot inner rim.

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Observation of light echoes around very young stars

Cited by 13 publications

References 43 publications

Light Echoes of Transients and Variables in the Local Universe

Light Echoes of Transients and Variables in the Local Universe

Light Echoes of Historic Transients

Revealing the inner circumstellar disk of the T Tauri star S Coronae Australis N using the VLTI

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