TRIPPy: TRAILED IMAGE PHOTOMETRY IN PYTHON

Fraser, Wesley C.; Alexandersen, Mike; Schwamb, Megan E.; Marsset, Michaël; Pike, Rosemary E.; Kavelaars, J. J.; Bannister, Michele; Benecchi, Susan; Delsanti, A.

doi:10.3847/0004-6256/151/6/158

Cited by 36 publications

(46 citation statements)

References 7 publications

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“…The zeropoints of the science images were set from those of the calibrator temporally closest to each science image, introducing 0.02 mag of uncertainty in the calibration of those frames to encompass the size of the variation in the zeropoint. An additional 0.02 mag uncertainty is due to the indirect measure of the aperture correction (Fraser et al 2016). For the J-band NIRI photometry, we apply a mean aperture correction of 0.03 mag on the 1I/'Oumuamua data.…”

Section: Data Reductionmentioning

confidence: 99%

“…Photometric measurements on all Gemini data ( Table 1) were performed with TRIPPy (Fraser et al 2016), using a round aperture with a radius of 3.0×the point-spread function's (PSF) FWHM. Because of the non-sidereal tracking of our target, the elongated stars in the 1I/'Oumuamua images cannot be used to compute a point-source aperture correction.…”

Section: Data Reductionmentioning

confidence: 99%

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Col-OSSOS: Colors of the Interstellar Planetesimal 1I/‘Oumuamua

Bannister¹,

Schwamb

Fraser³

et al. 2017

ApJL

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116

100

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The recent discovery by Pan-STARRS1 of 1I/2017 U1 ('Oumuamua), on an unbound and hyperbolic orbit, offers a rare opportunity to explore the planetary formation processes of other stars and the effect of the interstellar environment on a planetesimal surface. 1I/'Oumuamua's close encounter with the inner solar system in 2017 October was a unique chance to make observations matching those used to characterize the small-body populations of our own solar system. We present near-simultaneous g′, r′, and J photometry and colors of 1I/'Oumuamua from the 8.1m Frederick C. Gillett Gemini-North Telescope and gri photometry from the 4.2 m William Herschel Telescope. Our g′r′J observations are directly comparable to those from the high-precision Colours of the Outer Solar System Origins Survey (Col-OSSOS), which offer unique diagnostic information for distinguishing between outer solar system surfaces. The J-band data also provide the highest signal-to-noise measurements made of 1I/'Oumuamua in the near-infrared. Substantial, correlated near-infrared and optical variability is present, with the same trend in both near-infrared and optical. Our observations are consistent with 1I/'Oumuamua rotating with a double-peaked period of 8.10±0.42 hr and being a highly elongated body with an axial ratio of at least 5.3:1, implying that it has significant internal cohesion. The color of the first interstellar planetesimal is at the neutral end of the range of solar system g−r and r−J solar-reflectance colors: it is like that of some dynamically excited objects in the Kuiper Belt and the less-red Jupiter Trojans.

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Section: Data Reductionmentioning

confidence: 99%

Section: Data Reductionmentioning

confidence: 99%

Col-OSSOS: Colors of the Interstellar Planetesimal 1I/‘Oumuamua

Bannister¹,

Schwamb

Fraser³

et al. 2017

ApJL

Self Cite

116

100

View full text Add to dashboard Cite

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“…The majority of the targets were sidereally tracked; however, due to an error in the program setup, for 2013 UQ 15 (o3l77), 2013 UL 15 (o3l43), and 2001 QF 331 (o3l06PD), the object was tracked instead of the stars. We use the Trailed Image Photometry in Python (TRIPPy) software package, which makes use of a pill-shaped aperture (Fraser et al 2016). This pill-shaped aperture is an extension of the circular aperture photometric measurement method, where the aperture shape is elongated based on object rate of motion, which is used to make a more accurate aperture correction than a purely circular aperture.…”

Section: Observationsmentioning

confidence: 99%

Col-OSSOS: z-Band Photometry Reveals Three Distinct TNO Surface Types

Pike

Fraser

Schwamb

et al. 2017

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Several different classes of trans-Neptunian objects (TNOs) have been identified based on their optical and near-infrared colors. As part of the Colours of the Outer Solar System Origins Survey (Col-OSSOS), we have obtained g-, r-, and z-band photometry of 26 TNOs using Subaru and Gemini Observatories. Previous color surveys have not utilized z-band reflectance, and the inclusion of this band reveals significant surface reflectance variations between sub-populations. The colors of TNOs in g−r and r−z show obvious structure, and appear consistent with the previously measured bi-modality in g−r. The distribution of colors of the two dynamically excited surface types can be modeled using the two-component mixing models from Fraser & Brown. With the combination of g−r and r−z, the dynamically excited classes can be separated cleanly into red and neutral surface classes. In g−r and r−z, the two dynamically excited surface groups are also clearly distinct from the cold classical TNO surfaces, which are red, with  -g r 0.85 and r−z  0.6, while all dynamically excited objects with similar g−r colors exhibit redder r−z colors. The z-band photometry makes it possible for the first time to differentiate the red excited TNO surfaces from the red cold classical TNO surfaces. The discovery of different r−z colors for these cold classical TNOs makes it possible to search for cold classical surfaces in other regions of the Kuiper Belt and to completely separate cold classical TNOs from the dynamically excited population, which overlaps in orbital parameter space.

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“…Due to the difficulty of merging the astrometric plate solutions to that of OSSOS from CFHT, the Subaru and Gemini observations do not contribute to our determination of 2013 SY 99 's orbit (Section 3.1). Aperture photometry was measured with the moving-object photometry package TRIPPy (Fraser et al 2016), which includes point-spread function (PSF) fitting and subtraction. We find no evidence for binarity of 2013 SY 99 .…”

Section: Sy 99mentioning

confidence: 99%

OSSOS. V. Diffusion in the Orbit of a High-perihelion Distant Solar System Object

Bannister¹,

Shankman²,

Volk³

et al. 2017

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We report the discovery of the minor planet 2013 SY 99 on an exceptionally distant, highly eccentric orbit. With a perihelion of 50.0au, 2013 SY 99 's orbit has a semimajor axis of 730±40au, the largest known for a highperihelion trans-Neptunian object (TNO), and well beyond those of (90377) Sedna and 2012 VP 113 . Yet, with an aphelion of 1420±90au, 2013 SY 99 's orbit is interior to the region influenced by Galactic tides. Such TNOs are not thought to be produced in the current known planetary architecture of the solar system, and they have informed the recent debate on the existence of a distant giant planet. Photometry from the Canada-France-Hawaii Telescope, Gemini North, and Subaru indicate 2013 SY 99 is ∼250km in diameter and moderately red in color, similar to other dynamically excited TNOs. Our dynamical simulations show that Neptune's weak influence during 2013 SY 99 's perihelia encounters drives diffusion in its semimajor axis of hundreds of astronomical units over 4Gyr. The overall symmetry of random walks in the semimajor axis allows diffusion to populate 2013 SY 99 's orbital parameter space from the 1000 to 2000au inner fringe of the Oort cloud. Diffusion affects other known TNOs on orbits with perihelia of 45 to 49au and semimajor axes beyond 250au. This provides a formation mechanism that implies an extended population, gently cycling into and returning from the inner fringe of the Oort cloud.

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TRIPPy: TRAILED IMAGE PHOTOMETRY IN PYTHON

Cited by 36 publications

References 7 publications

Col-OSSOS: Colors of the Interstellar Planetesimal 1I/‘Oumuamua

Col-OSSOS: Colors of the Interstellar Planetesimal 1I/‘Oumuamua

Col-OSSOS: z-Band Photometry Reveals Three Distinct TNO Surface Types

OSSOS. V. Diffusion in the Orbit of a High-perihelion Distant Solar System Object

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