J/ApJ/710/1724 Follow-up photometry for HAT-P-11 (Bakos+, 2010)
HAT-P-11b: a super-Neptune planet transiting a bright K star in the Kepler
field.
Bakos G.A., Torres G., Pal A., Hartman J., Kovacs G., Noyes R.W.,
Latham D.W., Sasselov D.D., Sipocz B., Esquerdo G.A., Fischer D.A.,
Johnson J.A., Marcy G.W., Butler R.P., Isaacson H., Howard A., Vogt S.,
Kovacs G., Fernandez J., Moor A., Stefanik R.P., Lazar J., Papp I., Sari P.
<Astrophys. J., 710, 1724-1745 (2010)>
=2010ApJ...710.1724B 2010ApJ...710.1724B
ADC_Keywords: Photometry ; Planets ; Radial velocities ; Stars, K-type ;
Stars, double and multiple
Keywords: planetary systems - stars: individual (HAT-P-11, GSC 03561-02092) -
techniques: photometric - techniques: spectroscopic
Abstract:
We report on the discovery of HAT-P-11b, the smallest radius
transiting extrasolar planet (TEP) discovered from the ground, and the
first hot Neptune discovered to date by transit searches. HAT-P-11b
orbits the bright (V=9.587) and metal rich ([Fe/H]=+0.31±0.05) K4
dwarf star GSC 03561-02092 with P=4.8878162±0.0000071 days and
produces a transit signal with depth of 4.2mmag, the shallowest found
by transit searches that is due to a confirmed planet. We present a
global analysis of the available photometric and radial velocity (RV)
data that result in stellar and planetary parameters, with
simultaneous treatment of systematic variations. HAT-P-11b orbits in
an eccentric orbit with e=0.198±0.046 and
ω=355.2°±17.3°, causing a reflex motion of its parent
star with amplitude 11.6±1.2m/s, a challenging detection due to the
high level of chromospheric activity of the parent star. Our ephemeris
for the transit events is Tc=2454605.89132±0.00032 (BJD), with
duration 0.0957±0.0012 days, and secondary eclipse epoch of
2454608.96±0.15 days (BJD).
Description:
The 8.4°x8.4° region around GSC 03561-02092, a field
internally labeled as "G155," was observed on a nightly basis in two
seasons, whenever weather conditions permitted. First, during the Fall
of 2004, we acquired 1213 frames with the HAT-6 instrument located at
FLWO, and 4091 frames with HAT-9 located at SMA, Mauna Kea. We
revisited the field in 2005, and acquired an additional 6166 frames
with HAT-9. Altogether we gathered 11470 5 minute exposures at a 5.5
minute cadence.
We launched an extensive photometry follow-up campaign, and attempted
transit observations of HAT-P-11b altogether 12 times in 2007 and
2008, leading to ∼10 successful observations of partial or full
transits (see Note (2) of table2.dat). We primarily used the FLWO 1.2m
telescope and the KeplerCam CCD in Sloan z band. The last observation
on 2008 November 20/21 MST was taken through Sloan r band.
Following the procedures described in Latham et al. (2009,
Cat. J/ApJ/704/1107), we used the CfA Digital Speedometers (DS),
mounted on the 1.5m Wyeth Reflector at the Oak Ridge Observatory in
Harvard, Massachusetts, and on the 1.5m Tillinghast Reflector at FLWO,
to obtain low S/N ratio high-resolution spectra. Altogether five
spectra were obtained between 2001 December 17 and 2007 June 5. The
signal-to-noise ratios ranged from 10 to 18 per spectral resolution
element of 8.5km/s.
Objects:
---------------------------------------------------------------------
RA (2000) DE Designation(s) (Period)
---------------------------------------------------------------------
19 50 50.25 +48 04 51.1 HAT-P-11 = GSC 03561-02092 (P=4.8878162)
---------------------------------------------------------------------
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table2.dat 52 4709 Follow-up photometry for HAT-P-11
table3.dat 50 53 Relative radial velocity measurements of HAT-P-11
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See also:
V/133 : Kepler Input Catalog (Kepler Mission Team, 2009)
J/MNRAS/411/L46 : Exoplanet magnetic fields (Vidotto+, 2011)
J/MNRAS/411/435 : Stellar parameters and extinction (Bailer-Jones, 2011)
http://www.exoplanet.eu/catalog-transit.php : Extra-solar Planets Catalog
Byte-by-byte Description of file: table2.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 13 F13.5 d BJD Barycentric Julian Date
15- 22 F8.5 mag mag Best detrended magnitude (1)
24- 30 F7.5 mag e_mag Estimated error in Bmag
32- 39 F8.5 mag Rawmag Magnitude before detrending; raw magnitude
41 A1 --- Filt Filter used in observation (I, r, z)
43- 44 I2 --- TNum Transit number (2)
46- 52 A7 --- Inst Instrument used in observation (3)
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Note (1): Normalized to 0.0 out of transit.
Note (2): Transit number as in table 1:
-----------------------------------------------
Local Date Inst Filt TNum Type
-----------------------------------------------
2007.0902 FLWO12 z 0 OIBEO
2007.0907 FLWO12 z 1 -BEO
2007.1021 FLWO12 z 10 OIBE(O)
2008.0518 FLWO12 z 53 (OI)BEO
2008.0701 FLWO12 z 62 OIB-
2008.0903 Schmidt Ic 75 OIBEO
2008.1002 FLWO12 z 81 OIBEO
2008.1007 FLWO12 z 82 OIBEO
2008.1115 FLWO12 z 90 OIB-
2008.1120 FLWO12 r 91 OIBEO
------------------------------------------------
TNum gives the transit event number, counted from the
zeroth follow-up event on 2007 September 2.
The Type column shows which parts of the transit were caught:
Out-of-transit (OOT), Ingress, Bottom, Egress.
Note (3): Instrument as follows:
FLWO12 = Fred Lawrence Whipple Observatory 1.2m telescope;
Schmidt = Schmidt 0.6m telescope.
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Byte-by-byte Description of file: table3.dat
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Bytes Format Units Label Explanations
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1- 13 F13.5 d BJD Barycentric Julian Date
15- 20 F6.2 m/s RV ? Radial velocity
22- 25 F4.2 m/s e_RV ? The 1σ error in RV
27- 32 F6.2 m/s O-C ? The (O-C) value
34- 39 F6.2 m/s BS The bisector span
41- 44 F4.2 m/s e_BS The 1σ error in BS
46- 50 F5.3 --- Sharp Stellar profile sharpness parameter
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History:
From electronic version of the journal
(End) Greg Schwarz [AAS], Emmanuelle Perret [CDS] 29-Mar-2012