The 'DODO' survey -I. Limits on ultra-cool substellar and planetary-mass companions to van Maanen's star (vMa2)

M. R. Burleigh; F. J. Clarke; E. Hogan; C. S. Brinkworth; P. Bergeron; P. Dufour; P. D. Dobbie; A. J. Levan; S. T. Hodgkin; D. W. Hoard; S. Wachter

doi:10.1111/j.1745-3933.2008.00446.x

The 'DODO' survey -I. Limits on ultra-cool substellar and planetary-mass companions to van Maanen's star (vMa2)

M. R. Burleigh, F. J. Clarke, E. Hogan, C. S. Brinkworth, P. Bergeron, P. Dufour, P. D. Dobbie, A. J. Levan, S. T. Hodgkin, D. W. Hoard, S. Wachter

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18 Scopus citations

Abstract

We report limits in the planetary-mass regime for companions around the nearest single white dwarf to the Sun, van Maanen's star (vMa 2), from deep J-band imaging with Gemini North and Spitzer Infrared Array Camera (IRAC) mid-IR photometry. We find no resolved common proper motion companions to vMa 2 at separations from 3 to 45 arcsec, at a limiting magnitude of J ≈ 23. Assuming a total age for the system of 4.1 ± 1 Gyr, and utilizing the latest evolutionary models for substellar objects, this limit is equivalent to companion masses >7 ± 1 M_Jup(T_eff ≈ 300 K). Taking into account the likely orbital evolution of very low mass companions in the post-main-sequence phase, these J-band observations effectively survey orbits around the white dwarf progenitor from 3 to 50 au. There is no flux excess detected in any of the complimentary Spitzer IRAC mid-IR filters. We fit a white dwarf model atmosphere to the optical BVRI, JHK and IRAC photometry. The best solution gives T_eff = 6030 ± 240 K, log g = 8.10 ± 0.04 and, hence, M = 0.633 ± 0.022 M_⊙. We then place a 3σ upper limit of 10 ± 2M_Jup on the mass of any unresolved companion in the 4.5 μm band.

Original language	English
Pages (from-to)	L5-L9
Journal	Monthly Notices of the Royal Astronomical Society: Letters
Volume	386
Issue number	1
DOIs	https://doi.org/10.1111/j.1745-3933.2008.00446.x
State	Published - May 2008
Externally published	Yes

Keywords

Infrared: stars
Planetary systems
Stars: low-mass, brown dwarfs
White dwarfs

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10.1111/j.1745-3933.2008.00446.x

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Burleigh, M. R., Clarke, F. J., Hogan, E., Brinkworth, C. S., Bergeron, P., Dufour, P., Dobbie, P. D., Levan, A. J., Hodgkin, S. T., Hoard, D. W., & Wachter, S. (2008). The 'DODO' survey -I. Limits on ultra-cool substellar and planetary-mass companions to van Maanen's star (vMa2). Monthly Notices of the Royal Astronomical Society: Letters, 386(1), L5-L9. https://doi.org/10.1111/j.1745-3933.2008.00446.x

@article{ffdfdbd39b384dfa8501f577f3d6a6d4,

title = "The 'DODO' survey -I. Limits on ultra-cool substellar and planetary-mass companions to van Maanen's star (vMa2)",

abstract = "We report limits in the planetary-mass regime for companions around the nearest single white dwarf to the Sun, van Maanen's star (vMa 2), from deep J-band imaging with Gemini North and Spitzer Infrared Array Camera (IRAC) mid-IR photometry. We find no resolved common proper motion companions to vMa 2 at separations from 3 to 45 arcsec, at a limiting magnitude of J ≈ 23. Assuming a total age for the system of 4.1 ± 1 Gyr, and utilizing the latest evolutionary models for substellar objects, this limit is equivalent to companion masses >7 ± 1 MJup(Teff ≈ 300 K). Taking into account the likely orbital evolution of very low mass companions in the post-main-sequence phase, these J-band observations effectively survey orbits around the white dwarf progenitor from 3 to 50 au. There is no flux excess detected in any of the complimentary Spitzer IRAC mid-IR filters. We fit a white dwarf model atmosphere to the optical BVRI, JHK and IRAC photometry. The best solution gives Teff = 6030 ± 240 K, log g = 8.10 ± 0.04 and, hence, M = 0.633 ± 0.022 M⊙. We then place a 3σ upper limit of 10 ± 2MJup on the mass of any unresolved companion in the 4.5 μm band.",

keywords = "Infrared: stars, Planetary systems, Stars: low-mass, brown dwarfs, White dwarfs",

author = "Burleigh, \{M. R.\} and Clarke, \{F. J.\} and E. Hogan and Brinkworth, \{C. S.\} and P. Bergeron and P. Dufour and Dobbie, \{P. D.\} and Levan, \{A. J.\} and Hodgkin, \{S. T.\} and Hoard, \{D. W.\} and S. Wachter",

year = "2008",

month = may,

doi = "10.1111/j.1745-3933.2008.00446.x",

language = "English",

volume = "386",

pages = "L5--L9",

journal = "Monthly Notices of the Royal Astronomical Society: Letters",

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Burleigh, MR, Clarke, FJ, Hogan, E, Brinkworth, CS, Bergeron, P, Dufour, P, Dobbie, PD, Levan, AJ, Hodgkin, ST, Hoard, DW & Wachter, S 2008, 'The 'DODO' survey -I. Limits on ultra-cool substellar and planetary-mass companions to van Maanen's star (vMa2)', Monthly Notices of the Royal Astronomical Society: Letters, vol. 386, no. 1, pp. L5-L9. https://doi.org/10.1111/j.1745-3933.2008.00446.x

TY - JOUR

T1 - The 'DODO' survey -I. Limits on ultra-cool substellar and planetary-mass companions to van Maanen's star (vMa2)

AU - Burleigh, M. R.

AU - Clarke, F. J.

AU - Hogan, E.

AU - Brinkworth, C. S.

AU - Bergeron, P.

AU - Dufour, P.

AU - Dobbie, P. D.

AU - Levan, A. J.

AU - Hodgkin, S. T.

AU - Hoard, D. W.

AU - Wachter, S.

PY - 2008/5

Y1 - 2008/5

N2 - We report limits in the planetary-mass regime for companions around the nearest single white dwarf to the Sun, van Maanen's star (vMa 2), from deep J-band imaging with Gemini North and Spitzer Infrared Array Camera (IRAC) mid-IR photometry. We find no resolved common proper motion companions to vMa 2 at separations from 3 to 45 arcsec, at a limiting magnitude of J ≈ 23. Assuming a total age for the system of 4.1 ± 1 Gyr, and utilizing the latest evolutionary models for substellar objects, this limit is equivalent to companion masses >7 ± 1 MJup(Teff ≈ 300 K). Taking into account the likely orbital evolution of very low mass companions in the post-main-sequence phase, these J-band observations effectively survey orbits around the white dwarf progenitor from 3 to 50 au. There is no flux excess detected in any of the complimentary Spitzer IRAC mid-IR filters. We fit a white dwarf model atmosphere to the optical BVRI, JHK and IRAC photometry. The best solution gives Teff = 6030 ± 240 K, log g = 8.10 ± 0.04 and, hence, M = 0.633 ± 0.022 M⊙. We then place a 3σ upper limit of 10 ± 2MJup on the mass of any unresolved companion in the 4.5 μm band.

AB - We report limits in the planetary-mass regime for companions around the nearest single white dwarf to the Sun, van Maanen's star (vMa 2), from deep J-band imaging with Gemini North and Spitzer Infrared Array Camera (IRAC) mid-IR photometry. We find no resolved common proper motion companions to vMa 2 at separations from 3 to 45 arcsec, at a limiting magnitude of J ≈ 23. Assuming a total age for the system of 4.1 ± 1 Gyr, and utilizing the latest evolutionary models for substellar objects, this limit is equivalent to companion masses >7 ± 1 MJup(Teff ≈ 300 K). Taking into account the likely orbital evolution of very low mass companions in the post-main-sequence phase, these J-band observations effectively survey orbits around the white dwarf progenitor from 3 to 50 au. There is no flux excess detected in any of the complimentary Spitzer IRAC mid-IR filters. We fit a white dwarf model atmosphere to the optical BVRI, JHK and IRAC photometry. The best solution gives Teff = 6030 ± 240 K, log g = 8.10 ± 0.04 and, hence, M = 0.633 ± 0.022 M⊙. We then place a 3σ upper limit of 10 ± 2MJup on the mass of any unresolved companion in the 4.5 μm band.

KW - Infrared: stars

KW - Planetary systems

KW - Stars: low-mass, brown dwarfs

KW - White dwarfs

UR - https://www.scopus.com/pages/publications/53549116781

U2 - 10.1111/j.1745-3933.2008.00446.x

DO - 10.1111/j.1745-3933.2008.00446.x

M3 - Letter

AN - SCOPUS:53549116781

SN - 1745-3933

VL - 386

SP - L5-L9

JO - Monthly Notices of the Royal Astronomical Society: Letters

JF - Monthly Notices of the Royal Astronomical Society: Letters

IS - 1

ER -

The 'DODO' survey -I. Limits on ultra-cool substellar and planetary-mass companions to van Maanen's star (vMa2)

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Keywords

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