Abstract
We report the first detection of DCO+ in a circumstellar disk. The DCO+ J=5–4 line at 360.169 GHz is observed with the 15 m James Clerk Maxwell Telescope in the disk around the pre-main sequence star TW Hya. Together with measurements of the HCO+ and H13CO+ J=4–3 lines, this allows an accurate determination of the DCO+/HCO+ ratio in this disk. The inferred value of0.035±0.005 is close to that found in cold pre-stellar cores and is somewhat higher than that measured in the envelope around the low-mass proto star IRAS 16293-2422. It is also close to the DCN/HCN ratio obtained for pristine cometary material in the jet of comet Hale-Bopp. The observed DCO+/HCO+ ratio for TW Hya is consistent with theoretical models of disks which consider gas-phase fractionation processes within a realistic 2-D temperature distribution and which include the effects of freeze-out onto grains.
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Aikawa, Y. and Herbst, E.: 1999, ApJ 526, 314.
Aikawa, Y. and Herbst, E.: 2001, A&A 371, 1107.
Aikawa, Y., Umebayashi, T., Nakano, T. and Miyama, S.M.: 1999, ApJ 519, 705.
Aikawa, Y., van Zadelhoff, G.J., van Dishoeck, E.F. and Herbst, E.: 2002, A&A 386, 622.
Beckwith, S.V.W.: 1999, in: C.J. Lada and N.D. Kylafis (eds.), Origin of Stars and Planetary Systems, Kluwer, Dordrecht, p. 579.
Blake, G.A., Qi, C., Hogerheijde, M.R., Gurwell, M.A. and Muhleman, D.O.: 1999, Nature 398, 213.
Brown, P.D. and Millar, T.J.: 1989, MNRAS 237, 661.
Butner, H.M., Lada, E.A. and Loren, R.B.: 1995, ApJ 448, 207.
Caselli, P., Walmsley, C.M., Tafalla, M., Dore, L. and Myers, P.C.: 1999, ApJ 523, L165.
Caselli, P., Walmsley, C.M., Zucconi, A., Tafalla, M., Dore, L. and Myers, P.C.: 2002, ApJ 565, 344.
Guélin, M., Langer, W.D., Snell, R.L. and Wootten, H.A.: 1977, ApJ 217, L165.
Kastner, J.H., Huenemoerder, D.P., Schulz, N.S., Canizares, C.R. and Weintraub, D.A.: 2002, ApJ 567, 434.
Krist, J.E., Stapelfeldt, K.R., Ménard, F., Padgett, D.L. and Burrows, C.J.: 2000, ApJ 538, 793.
Lis, D.C., Gerin, M., Phillips, T.G. and Motte, F.: 2002, ApJ 569, 322.
Loinard, L., Castets, A., Ceccarelli, C., Tielens, A.G.G.M., Faure, A., Caux, E. and Duvert, G.: 2000, A&A 359, 1169.
Markwick, A.J., Ilgner, M., Millar, T.J. and Henning, Th.: 2002, A&A 385, 632.
Meier, R., Owen, T.C., Jewitt, D.C. et al.: 1998, Science 279, 1707.
Millar, T.J., Bennett, A. and Herbst, E.: 1989, ApJ 340, 906.
Ohishi, M., Irvine, W.M. and Kaifu, N.: 1992, in: P.D. Singh (ed.), Astrochemistry of Cosmic Phenomena, IAU Symposium 150, Kluwer, Dordrecht, p. 171.
Pagani, L., Salez, M. and Wannier, P.G.: 1992, A&A 258, 479.
Parise, B., Ceccarelli, C., Tielens, A.G.G.M., et al.: 2002, A&A 393, L49.
Qi, C.: 2001, PhD Thesis, California Institute of Technology.
Roberts, H., Herbst, E. and Millar, T.J.: 2002, MNRAS 336, 283.
Schöier, F.L., Jorgensen, J.K., van Dishoeck, E.F. and Blake, G.A.: 2002, A&A 390, 1001.
Shah, R.Y. and Wootten, A.: 2001, ApJ 554, 933.
Stark, R., van der Tak, F.F.S. and van Dishoeck, E.F.: 1999, ApJ 521, L67.
Thi, W.F., van Zadelhoff, G.J. and van Dishoeck, E.F.: 2002, A&A, submitted.
Tielens, A.G.G.M.: 1983, A&A 119, 177.
Tiné, S., Roueff, E., Falgarone, E., Gerin, M. and Pineau des Forets, G.: 2000, A&A 356, 1039.
Turner, B.E.: 2001, ApJS 136, 579.
van Dishoeck, E.F., Blake, G.A., Jansen, D.J. and Groesbeck, T.D.: 1995, ApJ 447, 760.
van Zadelhoff, G.J., van Dishoeck, E.F., Thi, W.F. and Blake, G.A.: 2001, A&A 377, 566.
Watson, W.D.: 1976, Rev. Mod. Phys. 48, 513.
Webb, R.A., Zuckerman, B., Platais, I., Patience, J., White, R.J., Schwartz, M.J. and McCarthy, C.: 1999, ApJ 512, 63.
Willacy, K. and Langer, W.D.: 2000, ApJ 544, 903.
Williams, J.P., Bergin, E.A., Caselli, P., Myers, P.C. and Plume, R.: 1998, ApJ 503, 689.
Wilner, D.J., Ho, P.T.P., Kastner, J.H. and Rodríguez, L.F.: 2000, ApJ 534, L101.
Wootten, A., Loren, R.B. and Snell, R.L.: 1982, ApJ 255, 165.
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van Dishoeck, E., Thi, WF. & van Zadelhoff, GJ. Detection of DCO+ in a circumstellar disk. Astrophysics and Space Science 285, 691–698 (2003). https://doi.org/10.1023/A:1026113327303
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DOI: https://doi.org/10.1023/A:1026113327303