Abstract

We present a method for spectroscopic observations of exoplanets. Coronagraphic image of a star-planet system and its objective spectra are observed simultaneously. Stellar image and objective spectrum without coronagraphic suppression are also obtained as reference. By convolution of the coronagraphic image with the reference stellar spectrum, pseudo-objective spectra are synthesized. The difference between the observed and the synthesized pseudospectra reveals the distinctive features of planetary spectrum. We carry out laboratory demonstration of the proposed technique and show that the planetary spectrum is reconstructed.

© 2009 Optical Society of America

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References

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  1. http://vo.obspm.fr/exoplanets/encyclo/encycl.html.
  2. N. Woolf and J. R. Angel, Annu. Rev. Astron. Astrophys. 36, 507 (1998).
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    [CrossRef]
  12. J. A. Högbom, Astrophys. J. Suppl. 15, 417 (1974).
  13. A. R. Thompson, J. M. Moran, and G. W. Svenson, Interferometry and Synthesis in Radio Astronomy (Wiley, 1990).

2008

D. M. Stam, Astron. Astrophys. 482, 989 (2008).
[CrossRef]

2007

2006

N. Murakami, N. Baba, Y. Tate, Y. Sato, and M. Tamura, Publ. Astron. Soc. Pac. 118, 774 (2006).
[CrossRef]

2002

2001

2000

D. Rouan, P. Riaud, A. Boccaletti, Y. Clenet, and A. Labeyrie, Publ. Astron. Soc. Pac. 112, 1479 (2000).
[CrossRef]

1999

1998

N. Woolf and J. R. Angel, Annu. Rev. Astron. Astrophys. 36, 507 (1998).
[CrossRef]

1997

F. Roddier and C. Roddier, Publ. Astron. Soc. Pac. 109, 815 (1997).
[CrossRef]

1974

J. A. Högbom, Astrophys. J. Suppl. 15, 417 (1974).

Angel, J. R.

N. Woolf and J. R. Angel, Annu. Rev. Astron. Astrophys. 36, 507 (1998).
[CrossRef]

Baba, N.

Boccaletti, A.

D. Rouan, P. Riaud, A. Boccaletti, Y. Clenet, and A. Labeyrie, Publ. Astron. Soc. Pac. 112, 1479 (2000).
[CrossRef]

Clenet, Y.

D. Rouan, P. Riaud, A. Boccaletti, Y. Clenet, and A. Labeyrie, Publ. Astron. Soc. Pac. 112, 1479 (2000).
[CrossRef]

Ford, H. C.

W. B. Sparks and H. C. Ford, Astrophys. J. 578, 543 (2002).
[CrossRef]

Hardy, G. J.

Hashimoto, N.

Högbom, J. A.

J. A. Högbom, Astrophys. J. Suppl. 15, 417 (1974).

Ishigaki, T.

Labeyrie, A.

D. Rouan, P. Riaud, A. Boccaletti, Y. Clenet, and A. Labeyrie, Publ. Astron. Soc. Pac. 112, 1479 (2000).
[CrossRef]

Moran, J. M.

A. R. Thompson, J. M. Moran, and G. W. Svenson, Interferometry and Synthesis in Radio Astronomy (Wiley, 1990).

Morisaki, S.

Murakami, N.

Nguyen, H. T.

Riaud, P.

D. Rouan, P. Riaud, A. Boccaletti, Y. Clenet, and A. Labeyrie, Publ. Astron. Soc. Pac. 112, 1479 (2000).
[CrossRef]

Roddier, C.

F. Roddier and C. Roddier, Publ. Astron. Soc. Pac. 109, 815 (1997).
[CrossRef]

Roddier, F.

F. Roddier and C. Roddier, Publ. Astron. Soc. Pac. 109, 815 (1997).
[CrossRef]

Rouan, D.

D. Rouan, P. Riaud, A. Boccaletti, Y. Clenet, and A. Labeyrie, Publ. Astron. Soc. Pac. 112, 1479 (2000).
[CrossRef]

Sato, Y.

N. Murakami, N. Baba, Y. Tate, Y. Sato, and M. Tamura, Publ. Astron. Soc. Pac. 118, 774 (2006).
[CrossRef]

Schmidtlin, E. G. H.

Serabyn, E.

Sparks, W. B.

W. B. Sparks and H. C. Ford, Astrophys. J. 578, 543 (2002).
[CrossRef]

Stam, D. M.

D. M. Stam, Astron. Astrophys. 482, 989 (2008).
[CrossRef]

Svenson, G. W.

A. R. Thompson, J. M. Moran, and G. W. Svenson, Interferometry and Synthesis in Radio Astronomy (Wiley, 1990).

Tamura, M.

N. Murakami, N. Baba, Y. Tate, Y. Sato, and M. Tamura, Publ. Astron. Soc. Pac. 118, 774 (2006).
[CrossRef]

Tate, Y.

N. Murakami, N. Baba, Y. Tate, Y. Sato, and M. Tamura, Publ. Astron. Soc. Pac. 118, 774 (2006).
[CrossRef]

Thompson, A. R.

A. R. Thompson, J. M. Moran, and G. W. Svenson, Interferometry and Synthesis in Radio Astronomy (Wiley, 1990).

Wallace, J. K.

Woolf, N.

N. Woolf and J. R. Angel, Annu. Rev. Astron. Astrophys. 36, 507 (1998).
[CrossRef]

Zubko, N.

Annu. Rev. Astron. Astrophys.

N. Woolf and J. R. Angel, Annu. Rev. Astron. Astrophys. 36, 507 (1998).
[CrossRef]

Appl. Opt.

Astron. Astrophys.

D. M. Stam, Astron. Astrophys. 482, 989 (2008).
[CrossRef]

Astrophys. J.

W. B. Sparks and H. C. Ford, Astrophys. J. 578, 543 (2002).
[CrossRef]

Astrophys. J. Suppl.

J. A. Högbom, Astrophys. J. Suppl. 15, 417 (1974).

Opt. Express

Opt. Lett.

Publ. Astron. Soc. Pac.

F. Roddier and C. Roddier, Publ. Astron. Soc. Pac. 109, 815 (1997).
[CrossRef]

D. Rouan, P. Riaud, A. Boccaletti, Y. Clenet, and A. Labeyrie, Publ. Astron. Soc. Pac. 112, 1479 (2000).
[CrossRef]

N. Murakami, N. Baba, Y. Tate, Y. Sato, and M. Tamura, Publ. Astron. Soc. Pac. 118, 774 (2006).
[CrossRef]

Other

A. R. Thompson, J. M. Moran, and G. W. Svenson, Interferometry and Synthesis in Radio Astronomy (Wiley, 1990).

http://vo.obspm.fr/exoplanets/encyclo/encycl.html.

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Figures (5)

Fig. 1
Fig. 1

Experimental setup.

Fig. 2
Fig. 2

Experimental destructive images of a star and its planet models and their objective spectra obtained with FQPoM nulling coronagraph.

Fig. 3
Fig. 3

Reference image and spectrum for the first quadrant of FQPoM.

Fig. 4
Fig. 4

Differential spectra obtained by subtraction of calculated pseudospectra from observed spectra (top). The magnified portion cut from the upper spectra is also shown (bottom).

Fig. 5
Fig. 5

Comparison of spectra: planetary spectrum obtained without starlight (black curve) and planetary spectrum restored by using the differential spectrum in Fig. 4 (gray curve).

Equations (4)

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I i j = I dest i j k [ I ref ( i + shift ̱ i ) ( j + shift ̱ j ) ] ,
I cal. i j = n k n [ I ref ( i + shift ̱ i n ) ( j + shift ̱ j n ) ] ,
S pseudo i j = n k n [ S ref ( i + shift ̱ i n ) ( j + shift ̱ j n ) ] ,
S differential i j = S observed i j S pseudo i j ,

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