The WFC3 Galactic bulge treasury program

Metallicity estimates for the stellar population and exoplanet hosts

Thomas M. Brown, Kailash Sahu, Jay Anderson, Jason Tumlinson, Jeff A. Valenti, Ed Smith, Elizabeth J. Jeffery, Alvio Renzini, Manuela Zoccali, Henry C. Ferguson, Don A. VandenBerg, Howard E. Bond, Stefano Casertano, Elena Valenti, Dante Minniti, Mario Livio, Nino Panagia

Research output: Contribution to journalArticle

34 Citations (Scopus)

Abstract

We present new UV-to-IR stellar photometry of four low-extinction windows in the Galactic bulge, obtained with the Wide Field Camera 3 on the Hubble Space Telescope (HST). Using our five bandpasses we have defined reddening-free photometric indices sensitive to stellar effective temperature and metallicity. We find that the bulge populations resemble those formed via classical dissipative collapse: each field is dominated by an old (∼10 Gyr) population exhibiting a wide metallicity range (-1.5 ≲ [Fe/H] ≲ 0.5). We detect a metallicity gradient in the bulge population, with the fraction of stars at super-solar metallicities dropping from 41% to 35% over distances from the Galactic center ranging from 0.3 to 1.2 kpc. One field includes candidate exoplanet hosts discovered in the SWEEPS HST transit survey. Our measurements for 11 of these hosts demonstrate that exoplanets in the distinct bulge environment are preferentially found around high-metallicity stars, as in the solar neighborhood, supporting the view that planets form more readily in metal-rich environments.

Original languageEnglish (US)
JournalAstrophysical Journal Letters
Volume725
Issue number1 PART 2
DOIs
StatePublished - Dec 10 2010

Fingerprint

galactic bulge
extrasolar planets
metallicity
estimates
planet
Hubble Space Telescope
extinction
metal
stars
solar neighborhood
transit
temperature
photometry
planets
cameras
programme
gradients
metals
index

All Science Journal Classification (ASJC) codes

  • Astronomy and Astrophysics
  • Space and Planetary Science

Cite this

Brown, T. M., Sahu, K., Anderson, J., Tumlinson, J., Valenti, J. A., Smith, E., ... Panagia, N. (2010). The WFC3 Galactic bulge treasury program: Metallicity estimates for the stellar population and exoplanet hosts. Astrophysical Journal Letters, 725(1 PART 2). https://doi.org/10.1088/2041-8205/725/1/L19
Brown, Thomas M. ; Sahu, Kailash ; Anderson, Jay ; Tumlinson, Jason ; Valenti, Jeff A. ; Smith, Ed ; Jeffery, Elizabeth J. ; Renzini, Alvio ; Zoccali, Manuela ; Ferguson, Henry C. ; VandenBerg, Don A. ; Bond, Howard E. ; Casertano, Stefano ; Valenti, Elena ; Minniti, Dante ; Livio, Mario ; Panagia, Nino. / The WFC3 Galactic bulge treasury program : Metallicity estimates for the stellar population and exoplanet hosts. In: Astrophysical Journal Letters. 2010 ; Vol. 725, No. 1 PART 2.
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Brown, TM, Sahu, K, Anderson, J, Tumlinson, J, Valenti, JA, Smith, E, Jeffery, EJ, Renzini, A, Zoccali, M, Ferguson, HC, VandenBerg, DA, Bond, HE, Casertano, S, Valenti, E, Minniti, D, Livio, M & Panagia, N 2010, 'The WFC3 Galactic bulge treasury program: Metallicity estimates for the stellar population and exoplanet hosts', Astrophysical Journal Letters, vol. 725, no. 1 PART 2. https://doi.org/10.1088/2041-8205/725/1/L19

The WFC3 Galactic bulge treasury program : Metallicity estimates for the stellar population and exoplanet hosts. / Brown, Thomas M.; Sahu, Kailash; Anderson, Jay; Tumlinson, Jason; Valenti, Jeff A.; Smith, Ed; Jeffery, Elizabeth J.; Renzini, Alvio; Zoccali, Manuela; Ferguson, Henry C.; VandenBerg, Don A.; Bond, Howard E.; Casertano, Stefano; Valenti, Elena; Minniti, Dante; Livio, Mario; Panagia, Nino.

In: Astrophysical Journal Letters, Vol. 725, No. 1 PART 2, 10.12.2010.

Research output: Contribution to journalArticle

TY - JOUR

T1 - The WFC3 Galactic bulge treasury program

T2 - Metallicity estimates for the stellar population and exoplanet hosts

AU - Brown, Thomas M.

AU - Sahu, Kailash

AU - Anderson, Jay

AU - Tumlinson, Jason

AU - Valenti, Jeff A.

AU - Smith, Ed

AU - Jeffery, Elizabeth J.

AU - Renzini, Alvio

AU - Zoccali, Manuela

AU - Ferguson, Henry C.

AU - VandenBerg, Don A.

AU - Bond, Howard E.

AU - Casertano, Stefano

AU - Valenti, Elena

AU - Minniti, Dante

AU - Livio, Mario

AU - Panagia, Nino

PY - 2010/12/10

Y1 - 2010/12/10

N2 - We present new UV-to-IR stellar photometry of four low-extinction windows in the Galactic bulge, obtained with the Wide Field Camera 3 on the Hubble Space Telescope (HST). Using our five bandpasses we have defined reddening-free photometric indices sensitive to stellar effective temperature and metallicity. We find that the bulge populations resemble those formed via classical dissipative collapse: each field is dominated by an old (∼10 Gyr) population exhibiting a wide metallicity range (-1.5 ≲ [Fe/H] ≲ 0.5). We detect a metallicity gradient in the bulge population, with the fraction of stars at super-solar metallicities dropping from 41% to 35% over distances from the Galactic center ranging from 0.3 to 1.2 kpc. One field includes candidate exoplanet hosts discovered in the SWEEPS HST transit survey. Our measurements for 11 of these hosts demonstrate that exoplanets in the distinct bulge environment are preferentially found around high-metallicity stars, as in the solar neighborhood, supporting the view that planets form more readily in metal-rich environments.

AB - We present new UV-to-IR stellar photometry of four low-extinction windows in the Galactic bulge, obtained with the Wide Field Camera 3 on the Hubble Space Telescope (HST). Using our five bandpasses we have defined reddening-free photometric indices sensitive to stellar effective temperature and metallicity. We find that the bulge populations resemble those formed via classical dissipative collapse: each field is dominated by an old (∼10 Gyr) population exhibiting a wide metallicity range (-1.5 ≲ [Fe/H] ≲ 0.5). We detect a metallicity gradient in the bulge population, with the fraction of stars at super-solar metallicities dropping from 41% to 35% over distances from the Galactic center ranging from 0.3 to 1.2 kpc. One field includes candidate exoplanet hosts discovered in the SWEEPS HST transit survey. Our measurements for 11 of these hosts demonstrate that exoplanets in the distinct bulge environment are preferentially found around high-metallicity stars, as in the solar neighborhood, supporting the view that planets form more readily in metal-rich environments.

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U2 - 10.1088/2041-8205/725/1/L19

DO - 10.1088/2041-8205/725/1/L19

M3 - Article

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JO - Astrophysical Journal Letters

JF - Astrophysical Journal Letters

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