Models for the Eclipses of the T Tauri

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Models for the Eclipses of the T Tauri Star KH 15 D: Occultation Mapping

Models for the Eclipses of the T Tauri Star KH 15 D: Occultation Mapping of a Pre. Main-Sequence Star Josh Winn Harvard-Smithsonian Center for Astrophysics In collaboration with: Matt Holman, Kris Stanek, and Dimitar Sasselov (Cf. A), Johnson and Geoff Marcy (U. C. Berkeley), Catrina Hamilton (Mt. Holyoke), Bill Herbst (Wesleyan)

The Case of the Mysterious Winking Star Josh Winn Harvard-Smithsonian Center for Astrophysics In

The Case of the Mysterious Winking Star Josh Winn Harvard-Smithsonian Center for Astrophysics In collaboration with: Matt Holman, Kris Stanek, and Dimitar Sasselov (Cf. A), Johnson and Geoff Marcy (U. C. Berkeley), Catrina Hamilton (Mt. Holyoke), Bill Herbst (Wesleyan)

T. A. Rector and B. A. Wolpa (NRAO/AUI/NSF and NOAO/AURA/NSF)

T. A. Rector and B. A. Wolpa (NRAO/AUI/NSF and NOAO/AURA/NSF)

Spectral energy distribution of TW Hya Disk Photosphere Calvet et al.

Spectral energy distribution of TW Hya Disk Photosphere Calvet et al.

T. A. Rector and B. A. Wolpa (NRAO/AUI/NSF and NOAO/AURA/NSF)

T. A. Rector and B. A. Wolpa (NRAO/AUI/NSF and NOAO/AURA/NSF)

T. A. Rector and B. A. Wolpa (NRAO/AUI/NSF and NOAO/AURA/NSF)

T. A. Rector and B. A. Wolpa (NRAO/AUI/NSF and NOAO/AURA/NSF)

Rotation periods of premainsequence stars Lamm et al. (2003)

Rotation periods of premainsequence stars Lamm et al. (2003)

The unusual star 15 D Kearns & Herbst (1998)

The unusual star 15 D Kearns & Herbst (1998)

The unusual star 15 D Kearns & Herbst (1998)

The unusual star 15 D Kearns & Herbst (1998)

The unusual star 15 D Kearns & Herbst (1998)

The unusual star 15 D Kearns & Herbst (1998)

The unusual star 15 D Kearns & Herbst (1998)

The unusual star 15 D Kearns & Herbst (1998)

The unusual star 15 D Kearns & Herbst (1998)

The unusual star 15 D Kearns & Herbst (1998)

The unusual star 15 D Kearns & Herbst (1998)

The unusual star 15 D Kearns & Herbst (1998)

The unusual star 15 D Kearns & Herbst (1998)

The unusual star 15 D Kearns & Herbst (1998)

Eclipses by circumstellar dust Kearns & Herbst (1998), Hamilton et al. (2001)

Eclipses by circumstellar dust Kearns & Herbst (1998), Hamilton et al. (2001)

Hamilton et al. , in preparation

Hamilton et al. , in preparation

Hamilton et al. , in preparation

Hamilton et al. , in preparation

Density waves in a protoplanetary disk (2 -d simulation by G. Bryden)

Density waves in a protoplanetary disk (2 -d simulation by G. Bryden)

Observations of KH 15 D VLT, Subaru, Hobby-Eberly, MMT, Magellan, Gemini, Keck, HST, Chandra,

Observations of KH 15 D VLT, Subaru, Hobby-Eberly, MMT, Magellan, Gemini, Keck, HST, Chandra, Spitzer…

Observations of KH 15 D VLT, Subaru, Hobby-Eberly, MMT, Magellan, Gemini, Keck, HST, Chandra,

Observations of KH 15 D VLT, Subaru, Hobby-Eberly, MMT, Magellan, Gemini, Keck, HST, Chandra, Spitzer… Harvard College Observatory plate stacks (1913 -1951)

Observations of KH 15 D VLT, Subaru, Hobby-Eberly, MMT, Magellan, Gemini, Keck, HST, Chandra,

Observations of KH 15 D VLT, Subaru, Hobby-Eberly, MMT, Magellan, Gemini, Keck, HST, Chandra, Spitzer… Harvard College Observatory plate stacks (1913 -1951) The Astrophysical Observatory of Asiago (1967 -1981)

Archival observations of KH 15 D Johnson & Winn (2004)

Archival observations of KH 15 D Johnson & Winn (2004)

Archival observations of KH 15 D Johnson & Winn (2004)

Archival observations of KH 15 D Johnson & Winn (2004)

Archival observations of KH 15 D • The bright state was >2 times brighter

Archival observations of KH 15 D • The bright state was >2 times brighter Johnson & Winn (2004)

Archival observations of KH 15 D • The bright state was >2 times brighter

Archival observations of KH 15 D • The bright state was >2 times brighter • The fractional variations were only 54% instead of 95% Johnson & Winn (2004)

Archival observations of KH 15 D • The bright state was >2 times brighter

Archival observations of KH 15 D • The bright state was >2 times brighter • The fractional variations were only 54% instead of 95% • The phase of minimum light was shifted by ≈180° Johnson & Winn (2004)

Archival observations of KH 15 D There is a second star in the system,

Archival observations of KH 15 D There is a second star in the system, which is presently obscured. Johnson & Winn (2004)

Archival observations of KH 15 D • Where did the second star go? Johnson

Archival observations of KH 15 D • Where did the second star go? Johnson & Winn (2004)

Archival observations of KH 15 D • Where did the second star go? •

Archival observations of KH 15 D • Where did the second star go? • Why is there little or no radial velocity variation? Johnson & Winn (2004)

Archival observations of KH 15 D • Where did the second star go? •

Archival observations of KH 15 D • Where did the second star go? • Why is there little or no radial velocity variation? • Why was there a phase shift? Johnson & Winn (2004)

Archival observations of KH 15 D What causes the eclipses and their evolution? Johnson

Archival observations of KH 15 D What causes the eclipses and their evolution? Johnson & Winn (2004)

B A

B A

1950 B A

1950 B A

Flux 1950 B A Time

Flux 1950 B A Time

Flux 1970 A Time

Flux 1970 A Time

Flux 1980 A Time

Flux 1980 A Time

Flux 2000 A Time

Flux 2000 A Time

Flux 2004 A Time

Flux 2004 A Time

Flux 1995 A Time

Flux 1995 A Time

KH 15 D: gradual occultation of a pre -main-sequence binary Winn et al. (2004)

KH 15 D: gradual occultation of a pre -main-sequence binary Winn et al. (2004) Flux 1995 A Time

KH 15 D: gradual occultation of a pre -main-sequence binary Winn et al. (2004)

KH 15 D: gradual occultation of a pre -main-sequence binary Winn et al. (2004)

KH 15 D: gradual occultation of a pre -main-sequence binary Winn et al. (2004)

KH 15 D: gradual occultation of a pre -main-sequence binary Winn et al. (2004)

KH 15 D: gradual occultation of a pre -main-sequence binary Winn et al. (2004)

KH 15 D: gradual occultation of a pre -main-sequence binary Winn et al. (2004)

KH 15 D: a spectroscopic binary Johnson et al. (2004)

KH 15 D: a spectroscopic binary Johnson et al. (2004)

But what is the foreground screen?

But what is the foreground screen?

Precession of a circumbinary disk Winn et al. (2004), Chiang & Murray-Clay (2004)

Precession of a circumbinary disk Winn et al. (2004), Chiang & Murray-Clay (2004)

Precession of a circumbinary disk

Precession of a circumbinary disk

Precession of a circumbinary disk

Precession of a circumbinary disk

Precession of a circumbinary disk

Precession of a circumbinary disk

Precession of a circumbinary disk

Precession of a circumbinary disk

Precession of a circumbinary disk

Precession of a circumbinary disk

Precession of a circumbinary disk

Precession of a circumbinary disk

Precession of a circumbinary disk

Precession of a circumbinary disk

Precession of a circumbinary disk

Precession of a circumbinary disk

Precession of a circumbinary disk

Precession of a circumbinary disk

Precession of a circumbinary disk

Precession of a circumbinary disk

Precession of a circumbinary disk

Precession of a circumbinary disk

Precession of a circumbinary disk

Precession of a circumbinary disk

Precession of a circumbinary disk

Precession of a circumbinary disk

Precession of a circumbinary disk

Precession of a circumbinary disk

Precession of a circumbinary disk

Precession of a circumbinary disk

Precession of a circumbinary disk

Precession of a circumbinary disk

Precession of a circumbinary disk

Precession of a circumbinary disk

Precession of a circumbinary disk

Precession of a circumbinary disk

Precession of a circumbinary disk

Precession of a circumbinary disk

Precession of a circumbinary disk

Precession of a circumbinary disk

Precession of a circumbinary disk

Precession of a circumbinary disk

Precession of a circumbinary disk

Precession of a circumbinary disk

Precession of a circumbinary disk

Precession of a circumbinary disk

Precession of a circumbinary disk .

Precession of a circumbinary disk .

The “cloud” is really the edge of a precessing circumbinary disk. Winn et al.

The “cloud” is really the edge of a precessing circumbinary disk. Winn et al. (2004) Chiang & Murray-Clay (2004) .

What will we learn from this system?

What will we learn from this system?

We only have about 5 years left!

We only have about 5 years left!