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

Research output: Contribution to journal › Letter › peer-review

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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