UIS Henry Barber Research Observatory

20-inch Telescope SN 2009ip

"Supernova" SN2009ip

SN2009ip has previously undergone more than one eruption over the past several years. In late August 2012, Drake et al. ( ATEL #4334) reported another eruption. It reached a peak in brightness and started to decline. But then on September 24-25 UT its brightness dramatically increased about 3 magnitudes in under 50 hours.

This page is a compliation of V, R, & I photometry of SN2009ip from various sources. All of the sources are listed below. But a majority of the most recent data is from Franz-Josef Hambsch and his Remote Observatory Atacama Desert. I want to specially thank and acknowledge Josch who has generously continued to feed us new images daily for this project.

I also want to thank T.-G. Tan & Ivan Curtis of the Pearth Exoplanet Survey Telescope for the high cadence measurements and coverage in R-band that they have been providing (see the bottom of the page).


What's New Today

March 6, 2014

  • The paper for the Astronomical Journal has been resubmitted to the referee. An updated version of the manuscript submitted is on astro-ph
  • June 16, 2013

    • We submitted a paper to the Astronomical Journal on this data specifically adressing the fluctuations in brightness during the decline.

    Publications

    Our data has been included in the following publications.


    Spectroscopy

    On October 9th UT, Terry Bohlsen of Austrailia got a spectrum of 2009ip. This is really impressive work for a C11 Telescope! I'll redirect you to his web page for details:

    http://users.northnet.com.au/~bohlsen/Nova/sn2009ip.htm


    Photometry

    Sources of Data

    The plots (unless otherwise noted) are a compilation of data from the following sources:

    Comparison Stars

    I have picked 20 stars within about six arcminutes of SN 2009ip from the APASS (AAVSO Photometric All-Sky Survey) to use as comparison stars for reducing calibrated photometry. This is a large number of comparisons but it allows for better number statistics on the calibration and computed errors and ensures that a transient problem with one of those stars does not have a large influence on the overall solution.

    Our calculated statistical errors on the solution range normally from 0.04 to 0.10 magnitudes. These one sigma error bars have been plotted on the (V-I) and (V-R) color plot, but are about the size of the points ploted on the other light curves

    I have been using VPHOT to reduce the data. Anyone who wants to use the same comparison stars can download this file:

    sn2009ip.comps.txt

    Or contact me and I am happy to share those with you through VPHOT or as an eXcel spreasheet.

    Offsets with Respect to Pastorello et al.

    Andrea Pastorello (http://arxiv.org/abs/1210.3568) has generously provided me with the photometric offsets between the comparisons his group has been using and the APASS comparioson photometry I have been using (and sharing with yall). The following corrections should be _added_ to photometry solutions done with APASS to directly compare with Pastorello et al.:

    dV = +0.063 dR = +0.046 dI = +0.023

    Please do NOT apply these corrections on photometry you are sending me. If you have that is okay, but I'd prefer not and please note clearly if you do. The purpose of these are for if you want to compare photometry you have measured using APASS standards with the work of Pastorello's group. In that case, apply those offsets before you make the comparison.

    V-Band Photometry

    The circles are data from sources listed above.

    V-band photometry of SN2009ip

    R-Band Photometry

    The circles are data from sources listed above and the crosses are data from http://www.rochesterastronomy.org/sn2009/sn2009ip.html (attributed to Brimacombe and Howerton on that page).

    V-band photometry of SN2009ip

    I-Band Photometry

    The circles are data from sources listed above and the crosses are data from http://www.rochesterastronomy.org/sn2009/sn2009ip.html (attributed to Brimacombe and Howerton on that page).

    V-band photometry of SN2009ip

    (V-R) and (V-I) Colors

    V-band photometry of SN2009ip

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    Last Updated: UT July 16, 2013

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